The new Audi A5 convertible has been on the market since last spring. The successor to the A4 convertible boasts both ample legroom and a little more glamour. Our test pitted a 2-liter diesel version against BMW's 320i convertible. Both models are standard-fitted with an engine start-stop button. drive it! shows you what they have in common - and where they differ. Prices for the BMW start at just over 41 thousand euros in Germany - which will buy you a diesel version of the Audi A5.