Mercedes AMG GT (2015) is 167 mm (6.57 inch) longer, 139 mm (5.47 inch) wider and has 200 liters (7.06 ft3) bigger cargo space than Porsche 718 Cayman (2014).
Porsche 718 Cayman (2014) is 6 mm (0.24 inch) higher and 204 kg (450 lbs) lighter than Mercedes AMG GT (2015).