I was terribly distressed to learn of your recent bout of COVID-19 and your unfortunate but necessary withdrawal from our long-anticipated rendezvous with the 2022 BMW M5 CS, the 2022 Cadillac CT5-V Blackwing, and the 2021 Mercedes-AMG GT63 S.

Equally disappointed was your dear friend Reggie Watts, the delightful band leader of The Late Late Show with James Corden and quite the car expert. Much to our relief, our mutual friend Ed Loh was able to make time in his busy schedule to take your place as our third.

Still, I recognize what a great letdown this must be for you, so you have my word I'll write often of our experience so that you may find some small comfort in your time of recuperation.

I hope my letter finds you well; may the following good news hasten your recovery. Today's activities reminded me of when we were last together with Ed. We had just become acquainted with the greatly anticipated M5 CS but were equally disappointed to learn BMW was unable to equip it with the proper tires. How sad we were the car couldn't perform at its best.

It is with much delight that I inform you this wrong has been put right. Finally, BMW has secured a set of the coveted Pirelli P Zero Corsa tires for our evaluation, and the difference is palpable to the skilled driver. No longer does the car seem skittish and struggling to maintain its hold of the road. Its monstrous power and sharp responses now are equaled by its purchase on the asphalt, doing away with the past concern the car would simply overpower the tires' rubber at a critical moment.

Curiously, these welcome subjective revelations are not supported by objectivity. Our colleagues in the testing department report the M5 CS is slightly less exceptional in all performance measurements on this gummy tire than on the Michelin tire we last experienced the car with, the one we both agreed wasn't up to the task. As highly as we regard our instrumented findings, surely you agree with Ed, Reggie, and myself that the confidence the operator has in the automobile is paramount. Ed and I, having previously flogged the car with the other tires, are of the same mind: These new tires are the driver's choice.

The M5 CS is an imperfect thing in some ways. None among us had kinder words for the front seats than we did the last time we were forced to occupy them. We also remained unenchanted by the needlessly thick steering wheel. Veteran critic Ed found it "fatiguing," and our newly minted judge Reggie agreed: "If I had to do a bunch of runs with that steering wheel, man, my hands would be so tired."

Less passionately, we were also disenchanted with the brake pedal response, which we all found soft under initial contact before firming up nicely. As Reggie put it to us, it's "a little light at the beginning of travel, and then it kind of bites down. Once you get used to it, it's fine, but I usually like—from beginning to end—a more firm pedal."

As you may suspect, we remain unimpressed with the complexity of the interface required to tailor the car's myriad performance settings. I know you disagree, but having the Cadillac and Mercedes on hand was illustrative of how the system could be simplified without losing its range of customization. It's rare we find cause to advocate for more features to migrate to the touchscreen, but done well it effectively corrals all the buttons necessary to adjust vehicle systems in one intuitive place rather than scattering them across the vehicle's interior.

Quibbles aside, we collectively found the M5 CS to be utterly enthralling on a fine mountain byway. The ferocity of its acceleration, the ceaselessness of its grip on the pavement, and the nimbleness of its responses impressed us greatly.

I write in hopes your recovery has progressed since my last letter. I was recently reacquainted with a dear friend of ours who was with us when last we were together with Ed, the CT5-V Blackwing. These many months have been far too long, and we were thankful to have this time together again. It was as if nothing had changed, though the Cadillac did trade its lovely manual transmission for a more fashionable 10-speed automatic.

We introduced the Blackwing to our mutual friend Reggie in hopes they would hit it off, but it was not to be. Much as he enjoyed the car's poise and capability, he simply could not reach an accord with the programming of the automatic transmission. In addition to the Cadillac's many adjustable performance parameters, the manufacturer has of late introduced a performance gear-shifting algorithm that attempts to identify a driver's intent and deliver the transmission's most raceworthy calibration. While Ed and I took no issue with it, the program simply did not suit Reggie's driving style, and it frustrated him to no end.

The only other manner in which the Blackwing failed to endear us was in its top-end power delivery, an artifact of its pushrod-valved and supercharged engine design. In any normal circumstance, the car's power is intoxicating, but in the company of vehicles with enormous top-end power that never seems to taper off, the Blackwing never felt as powerful as the M5 CS or GT63 S despite having the greatest output of the three.

This dichotomy is represented clearly in the measured testing results and undoubtedly attributable to its status as the only rear-driven car present. In choosing not to route power to the forward axle, Cadillac has foregone the performance advantages offered in favor of the vehicle's dynamic character.

What a character it is! We have to say this is the best rear-drive sedan ever made. The Blackwing's ability to effectively translate such overwhelming power to just two wheels boggles the mind. The driver can be just about as aggressive with the accelerator as they like while exiting a corner, and the car is able to apply its power almost wholly to acceleration rather than lose some amount to oversteer. It is truly remarkable.

Equally impressive is the CT5-V Blackwing's ability to decelerate. We were all in agreement, the stopping power and tactile feedback of the Blackwing's brakes stood head and shoulders above the others'. Even Reggie, who found the Cadillac's transmission so disagreeable, said its brakes were the best in his estimation.

We were all similarly infatuated with the car's handling and composure. We deemed it the most capable of absorbing roadway imperfections without disturbing its balance and deeply confidence-inspiring in its movements and reactions. We even found its seats the most comfortable while still providing adequate adjustable lateral support.

We must tip our hat to Cadillac for remaining steadfast in its commitment to the powerful rear-drive sedan, not as an anachronism but as a statement. We applaud the firm not only for standing on principle but also for putting in the elbow grease necessary to bring this concept to its fullest potential in the Blackwing.

I am optimistic this letter will see you soon reaching the end of your convalescence. I find occasion to write again after bumping into an old acquaintance, the GT63 S. It was The Before Times when last we met, and I remember thinking the AMG a skilled operator with a cold and detached personality. My memory served me well, as it has not changed its demeanor over the intervening years. Nor could it have recently, as Mercedes opted not to produce any for the 2022 model year.

Ed and Reggie agree. "It's sporty, but weirdly I didn't really want to drive it fast," Reggie said. "I drove it quickly, but not fast. This car's a really refined, badass tank that has power and can definitely corner, but it feels to me more luxurious than it does sporty."

Indeed, the instrumented results show it's either as capable as the BMW or nearly there in every metric. It is a truly quick car with stupendous brakes and delightful cornering prowess, but it makes no emotional connection with the driver. It's a shame, really. A car this capable ought to have no issue being enthralling.

Not just dispassionate, it hides its speed, as well. Each of us recounted at least one moment of arriving at a corner far more quickly than anticipated, the lack of feedback disguising the vehicle's true velocity. Thankfully, we found the brakes excellent, though they couldn't top the feel of the Blackwing's pedal.

Otherwise, the GT63 S is a fine piece of work. The interior is really quite an accomplishment, finely crafted in rich leather and sturdy stitching. True, the on-screen interface remains cumbersome and overly layered, but the new row of shortcut buttons is welcome. If only they weren't capacitive, and the same goes for the steering wheel controls.

The other issue meriting a mention is the dismal rear window. The car's massive hatch is certainly accommodating to cargo, but the necessary reinforcements encroach on the glass area. This would be a minor annoyance if not for the fixed rear wing, which bisects the window, further reducing visibility.

Although the GT63 S' flaws are few in number, the aloofness considerably dampened our enthusiasm for the car—especially considering its notably higher price.

I hope this last letter sees you fully recovered. I had a wonderful conversation with Ed and Reggie regarding our comparison and thought I should share our conclusions.

Between the M5 CS, CT5-V Blackwing, and GT63 S, we all shared a preference for the BMW. The power of its performance, the gracefulness of its handling, and the passion it showed us left us each in its thrall. It was a unanimous decision: The M5 CS is the greatest sport sedan in the land.

Our thoughts were less in lockstep regarding the other two. Ed and I were impressed by the poise and precision of the Blackwing, especially considering its two-wheel-drive chassis. Reggie, however, was still so frustrated by the transmission he ranked the Cadillac third.

We were similarly divided by the GT63 S. Here, Reggie found its style and demeanor appealing enough, but Ed and I remained unmoved. We struggled to find connection with the car despite our best efforts.

Verdict: Crazy capable but still unable to connect with the driver on an emotional level.

Verdict: The best rear-drive performance sedan ever made.

Verdict: At BMW, "CS" now means what just "M" used to—the M5 CS is the performance division at its greatest.