Comparison Test: BMW M6 Gran Coupe vs Audi RS7 vs Mercedes-Benz CLS63 AMG S
28 Sep 2013, 10:33 UTC · By: Gabriel Nica / Ever since the BMW M6 Gran Coupe was launched, the Audi RS7 was the car to compare it with, even though it took a while to see the Inglostadt-based manufacturer launch the high-performance S7....