BMW 7 Series (2019) is 662 mm (26.06 inch) longer, 99 mm (3.90 inch) wider, 197 mm (7.76 inch) higher and has 331 liters (11.69 ft3) bigger cargo space than Porsche 718 Cayman (2020).
Porsche 718 Cayman (2020) is 524 kg (1,155 lbs) lighter than BMW 7 Series (2019).