BMW 3 Series (2014) is 78 mm (3.07 inch) longer, 140 mm (5.51 inch) higher, 80 kg (176 lbs) lighter and has 130 liters (4.59 ft3) bigger cargo space than Mercedes AMG GT (2016).
Mercedes AMG GT (2016) is 129 mm (5.08 inch) wider than BMW 3 Series (2014).