Two Convertibles with more similarities, such as the body structure, market segment, ground shadow size, height, and maximum occupancy, than differences, like the horsepower, starting price, and fuel economy. First of all, there is a notable difference in the starting price of the 2016 BMW 4 Series Convertible, which is $11,350 less than the base MSRP of the 2015 Mercedes-Benz E-Class Convertible. And finally, the 2015 E-Class Convertible has a more powerful engine than the 2016 4 Series Convertible, and it gets 3 fewer miles on a gallon of fuel. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.