The CLS63 AMG despite having the highest horsepower rating at 577 traps less than both Audi and BMW at 122 miles per hour which is a bit surprising. Especially considering it also has the largest motor at 5.5 liters. The 0-130 time is also the slowest at 13.5 seconds. Hardly slow but the slowest out of the three. The Audi RS7 despite having the smallest motor manages to beat the CLS63 to 130 miles per hour and also traps 123 beating the CLS63.
Really, we're splitting hairs here but on paper it was expected for the facelifted Mercedes to easily dispatch with the competition in a straight line. The M6 is hardly light but it is the lightest in this company and the only car featuring a dual clutch transmission which likely contributes to its acceleration advantage once moving. It has the highest trap speed and the quickest 0-130 time. It also is only a tenth of a second off its all wheel drive competition in elapsed time through the quarter mile. Impressive, very impressive.
Despite the M6 impressing it is said to be benign by M standards (which were once lofty). It's good, but just is not as much fun as the Audi on back roads. Odd, considering the RS7 is nose heavy with 56.4/43.6 weight distribution. The M6 manages 51.5/48.5 and the CLS63 55.0/45.0. The all wheel drive cars pay a penalty with more weight on the nose.
Did the Audi RS7 deserve the win? The M6 Gran Coupe is rated as the best in performance. It is rated the best in steering feel which is a bit shocking. It is rated tied for first with the CLS63 in brake feel. It is rated first in handling. It is tied for first with the CLS63 in ride comfort. So why is the Audi more fun exactly when the ratings given especially for fun factor say something different when the M6 and RS7 are tied once scored? It just does not make any sense. Car and Driver writes one thing then scores it differently than what they are saying.
The Audi really picks up points in trunk space, features, styling, comfort, and ergonomics. But is it the best drivers car of the bunch? Did the M6 Gran Coupe get robbed? You decide.