BMW 5 Series (2020) is 485 mm (19.09 inch) longer, 64 mm (2.52 inch) wider, 208 mm (8.19 inch) higher and has 346 liters (12.22 ft3) bigger cargo space than Porsche 718 Cayman (2021).
Porsche 718 Cayman (2021) is 233 kg (514 lbs) lighter than BMW 5 Series (2020).