Compare the Jaguar XF R-S 5.0 V8 - [2012] vs Ford Mustang GT 500 - [2009]. 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 Jaguar XF R-S 5.0 V8 or the Ford Mustang GT 500. We'll leave it up to you to decide which is your favourite.