Mercedes GLK-Class (2017) is 158 mm (6.22 inch) longer, 40 mm (1.57 inch) wider, 406 mm (15.98 inch) higher and has 288 liters (10.17 ft3) bigger cargo space than Porsche Cayman (2014).
Porsche Cayman (2014) is 475 kg (1,047 lbs) lighter than Mercedes GLK-Class (2017).