BMW 5 Series Gran Turismo (2018) is 109 mm (4.29 inch) longer, 129 mm (5.08 inch) higher, 234 kg (516 lbs) lighter and has 180 liters (6.36 ft3) bigger cargo space than BMW 8 Series (G14) (2020).
BMW 8 Series (G14) (2020) is 35 mm (1.38 inch) wider than BMW 5 Series Gran Turismo (2018).