Mercedes GL-Class (2014) is 768 mm (30.24 inch) longer, 198 mm (7.80 inch) wider, 557 mm (21.93 inch) higher and has 518 liters (18.29 ft3) bigger cargo space than Porsche Cayman (2017).
Porsche Cayman (2017) is 1175 kg (2,590 lbs) lighter than Mercedes GL-Class (2014).