BMW 4 Series (2016) is 152 mm (5.98 inch) longer, 94 mm (3.70 inch) higher, 60 kg (132 lbs) lighter and has 95 liters (3.35 ft3) bigger cargo space than Mercedes AMG GT (2020).
Mercedes AMG GT (2020) is 69 mm (2.72 inch) wider than BMW 4 Series (2016).