BMW 5 Series Gran Turismo (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 304 kg (670 lbs) lighter than BMW 5 Series Gran Turismo (2020).