In 2009, Audi upped the luxury performance-car ante with the redesigned A4. Its fresh face and benchmark interior distinguished it from its Mercedes C-Class and BMW 3-Series competitors, while its new dimensions made it the largest car in its class. 2010 sees further refinements to the redesign, and with the sure-footedness of Audi's world-class quattro all-wheel-drive system, a powerful engine, the availability of a wagon, and the always-addictive oomph of the S4 model, Audi's sports sedan lineup has a little something for everyone.