BMW 5 Series Gran Turismo (2018) is 61 mm (2.40 inch) higher, 210 kg (463 lbs) lighter and has 90 liters (3.18 ft3) bigger cargo space than BMW 8 Series (G16) (2020).
BMW 8 Series (G16) (2020) is 139 mm (5.47 inch) longer and 65 mm (2.56 inch) wider than BMW 5 Series Gran Turismo (2018).