BMW 4 Series (2013) is 92 mm (3.62 inch) longer, 73 mm (2.87 inch) higher, 60 kg (132 lbs) lighter and has 95 liters (3.35 ft3) bigger cargo space than Mercedes AMG GT (2017).
Mercedes AMG GT (2017) is 114 mm (4.49 inch) wider than BMW 4 Series (2013).