BMW 7 Series (2016) is 640 mm (25.20 inch) longer, 99 mm (3.90 inch) wider, 208 mm (8.19 inch) higher and has 331 liters (11.69 ft3) bigger cargo space than Porsche 718 Cayman (2021).
Porsche 718 Cayman (2021) is 349 kg (769 lbs) lighter than BMW 7 Series (2016).