BMW X5 (2017) is 501 mm (19.72 inch) longer, 185 mm (7.28 inch) wider, 459 mm (18.07 inch) higher and has 500 liters (17.66 ft3) bigger cargo space than Porsche 718 Cayman (2014).
Porsche 718 Cayman (2014) is 909 kg (2,004 lbs) lighter than BMW X5 (2017).