UNLIKE many Mercedes-Benz sedans, the CLS four-door coupe isn’t a car for the totally pragmatic. Rather, it’s a sensuous sedan that appeals first to the visual senses before turning completely hedonistic and bathing the passengers in shameful luxury while titillating the driver with a melodious, powerful engine and sharp, responsive handling. The E-class sedan, which donated the CLS’s basic underlying structure, would be horrified at the wantonness of it all. Styling appeal is a matter of individual taste, but there aren’t many who remain un-captivated by the slinky Benz.