BMW 5 Series (2018) is 100 mm (3.94 inch) longer, 158 mm (6.22 inch) higher, 109 kg (240 lbs) lighter and has 149 liters (5.26 ft3) bigger cargo space than BMW 8 Series (G15) (2019).
BMW 8 Series (G15) (2019) is 35 mm (1.38 inch) wider than BMW 5 Series (2018).