Two Sedans with some similarities, but otherwise different in most aspects such as the starting price, horsepower, fuel economy, and maximum occupancy. First of all, there is a notable difference in the starting price of the 2015 Porsche Panamera, which is $44,100 less than the base MSRP of the 2016 BMW ALPINA B6 Gran Coupe. Also, the 2016 ALPINA B6 Gran Coupe has a more powerful engine than the 2015 Panamera, and it gets 2 fewer miles on a gallon of fuel. And finally, you'll seat one more passenger in the ALPINA B6 Gran Coupe than in the Panamera. Among similarities are the body structure, market segment, ground shadow size, and height.