Compare the Jaguar XJ 12 5.3 - [1972] vs BMW i8 1.5 Turbo Hybrid I12 - [2016]. 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 XJ 12 5.3 or the BMW i8 1.5 Turbo Hybrid I12. We'll leave it up to you to decide which is your favourite.