Mercedes G-Class (2016) is 386 mm (15.20 inch) longer, 67 mm (2.64 inch) wider, 661 mm (26.02 inch) higher and has 325 liters (11.48 ft3) bigger cargo space than Porsche Cayman (2020).
Porsche Cayman (2020) is 1190 kg (2,623 lbs) lighter than Mercedes G-Class (2016).