The third-generation A4 tries harder than ever to be a credible alternative to the class-leading BMW 3-Series and Mercedes C-Class. Although it looks very similar to the outgoing model, every body panel has changed and there's a new, more aggressive, look for the front end. There are also some new engine options, new gearboxes and the suspension has been redesigned. The formula is essentially unchanged but the A4 now has some extra polish to keep it on top of its game. It can't quite better its rivals, but it remains a worthy contender.