McLaren 650S Coupe (2015) is 154 mm (6.06 inch) wider and 177 kg (390 lbs) lighter than Mercedes AMG GT (2018).
Mercedes AMG GT (2018) is 34 mm (1.34 inch) longer, 86 mm (3.39 inch) higher and has 206 liters (7.27 ft3) bigger cargo space than McLaren 650S Coupe (2015).