Compare the Mercedes CLS Class 63 AMG Shooting Brake - [2012] vs Bentley Continental GT3-R 4.0 V8 Turbo - [2014]. Find out which car is the fastest, most powerful, lightest or has the biggest engine in our top trumps style comparison page. Find out which car has the highest top speed or is the fastest accelerating, is it the Mercedes CLS Class 63 AMG Shooting Brake or the Bentley Continental GT3-R 4.0 V8 Turbo. We'll leave it up to you to decide which is your favourite.