Audi Q7 (2014) is 708 mm (27.87 inch) longer, 200 mm (7.87 inch) wider, 444 mm (17.48 inch) higher and has 1027 liters (36.27 ft3) bigger cargo space than Porsche Cayman (2017).
Porsche Cayman (2017) is 950 kg (2,094 lbs) lighter than Audi Q7 (2014).