Two Convertibles with some similarities, but otherwise different in most aspects such as the starting price, horsepower, fuel economy, ground shadow size, height, and maximum occupancy. First of all, there is a notable difference in the starting price of the 2016 BMW Z4, which is $96,040 less than the base MSRP of the 2016 Maserati GranTurismo Convertible. Also, the 2016 GranTurismo Convertible has a more powerful engine and gets 7.5 mpg less than the 2016 Z4. In addition, the Z4 is both significantly smaller and slightly shorter than the GranTurismo Convertible. And finally, the Maserati GranTurismo Convertible seats two more passengers than the BMW Z4. Among similarities are the body structure and market segment.