BMW 5 Series (2014) is 541 mm (21.30 inch) longer, 97 mm (3.82 inch) wider, 290 mm (11.42 inch) higher and has 255 liters (9.01 ft3) bigger cargo space than Porsche 718 Cayman (2020).
Porsche 718 Cayman (2020) is 349 kg (769 lbs) lighter than BMW 5 Series (2014).