BMW 5 Series (2018) is 92 mm (3.62 inch) higher, 179 kg (395 lbs) lighter and has 129 liters (4.56 ft3) bigger cargo space than BMW 8 Series (G16) (2019).
BMW 8 Series (G16) (2019) is 139 mm (5.47 inch) longer and 65 mm (2.56 inch) wider than BMW 5 Series (2018).