BMW 5 Series (2014) is 156 mm (6.14 inch) longer, 219 mm (8.62 inch) higher, 24 kg (53 lbs) lighter and has 19 liters (0.67 ft3) bigger cargo space than BMW 8 Series (G15) (2019).
BMW 8 Series (G15) (2019) is 2 mm (0.08 inch) wider than BMW 5 Series (2014).