DRIVEN 2014 #7: Audi A3 Sedan 1.8T quattro vs Mercedes-Benz CLA 200 vs BMW 316i

Driven's final episode takes things up a notch, with three entry-level luxury sedans - the Audi A3 1.8 TFSI Sedan, Mercedes CLA 200 and BMW 316i. Which should you put your hard-earned money on?