Two Convertibles with some similarities, but otherwise different in most aspects such as the horsepower, model year, starting price, fuel economy, and maximum occupancy. First of all, the 2016 BMW 4 Series Convertible is priced $10,200 lower compared to the base MSRP of the 2014 Mercedes-Benz E-Class Convertible, which is older by two model years. Also, the 2014 E-Class Convertible has a more powerful engine and gets 4 mpg less than the 2016 4 Series Convertible. And finally, you'll seat two more passengers in the E-Class Convertible than in the 4 Series Convertible. Among similarities are the body structure, market segment, ground shadow size, and height.