BMW 5 Series (2018) is 100 mm (3.94 inch) longer, 160 mm (6.30 inch) higher, 208 kg (459 lbs) lighter and has 219 liters (7.73 ft3) bigger cargo space than BMW 8 Series (G14) (2018).
BMW 8 Series (G14) (2018) is 35 mm (1.38 inch) wider than BMW 5 Series (2018).