The Audi A4 has rightfully earned its place among the best of the luxury sport sedans. Audi styling, as always, meets at the intersection of classic and modern. Interior material quality is second-to-none. Combine a powerful engine with Audi's excellent quattro all-wheel-drive system, and the A4 makes strong competition to BMW's 3-Series and Mercedes' C-Class a serious run for the money, while its sporty sister the S4 evenly matches the M and AMG competition.