BMW 5 Series (2020) is 564 mm (22.20 inch) longer, 67 mm (2.64 inch) wider, 183 mm (7.20 inch) higher and has 380 liters (13.42 ft3) bigger cargo space than Porsche 718 Cayman (2014).
Porsche 718 Cayman (2014) is 243 kg (536 lbs) lighter than BMW 5 Series (2020).