Compare the BMW 5 Series M5 Competition Pack F10 - [2013] vs Mercedes SL Class 63 4Matic+ 4.0 V8 Twin Turbo - [2021]. 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 BMW 5 Series M5 Competition Pack F10 or the Mercedes SL Class 63 4Matic+ 4.0 V8 Twin Turbo. We'll leave it up to you to decide which is your favourite.