Mercedes AMG GT (2019) is 168 mm (6.61 inch) longer, 139 mm (5.47 inch) wider and has 188 liters (6.64 ft3) bigger cargo space than Porsche Cayman (2019).
Porsche Cayman (2019) is 4 mm (0.16 inch) higher and 240 kg (529 lbs) lighter than Mercedes AMG GT (2019).