In a classic Fifth Gear shootout Tiff Needell puts two of the latest high performance coupes up against each other to see which ones faster. Couple of things, first the track is damp, and second the Audi has four-wheel-drive. So you can kinda predict the result already. But we would go for the Merc simply because of its waggity tail. The Audi is a superb car but the C63 is a lot more fun. That said, if you want the finest car in this class, BMW M3 is still your best bet.