MEMPHIS, Tenn. — More than four years ago Hyundai answered the criticism that all mid-sized sedans look the same by stepping away from the stereotypical styling with the 2011 Sonata, a car so daringly different that it set a new tone for the design future of the popular segment. It was a smash hit not only for its good looks, but for its above-average performance, generous standard features, and improved build quality.