2012 Audi A7 vs. 2011 Jaguar XJ vs. 2012 Mercedes-Benz CLS550

Meet the 2012 Audi A7, 2012 Mercedes-Benz CLS550, and 2011 Jaguar XJ -- the automotive equivalent of haute couture. We take the three luxo sedans out to determine which one is the best all-around sedan.