Two Sedans with more similarities, such as the body structure, market segment, ground shadow size, and height, than differences, like the powertrain, horsepower, fuel economy, starting price, and maximum occupancy. First of all, the 2015 Cadillac CTS has bigger and thirstier engine; the 2016 Mercedes-Benz E-Class Sedan Diesel gets 9.2 more mpg. Also, the 2015 CTS is priced $7,305 lower compared to the base MSRP of the 2016 E-Class Sedan Diesel. In addition, the E-Class Sedan Diesel seats two more passengers than the CTS. Among similarities are the body structure, market segment, ground shadow size, and height.