2012 Mercedes Benz ClsMercedes-Benz struck styling gold with the first-generation CLS-Class, creating a new segment that sent rival automakers scrambling back to their design tables. Things are different the second time around, as the new 2012 CLS steps into a market suddenly littered with so-called ‘four-door coupes,’ with more on the way from Stuttgart’s German rivals Audi and BMW.With the