Mercedes GLS-Class (2020) is 957 mm (37.68 inch) longer, 156 mm (6.14 inch) wider, 530 mm (20.87 inch) higher and has 193 liters (6.82 ft3) bigger cargo space than Porsche Cayman (2015).
Porsche Cayman (2015) is 1040 kg (2,293 lbs) lighter than Mercedes GLS-Class (2020).