BMW 3 Series Touring (2018) is 88 mm (3.46 inch) higher, 70 kg (154 lbs) lighter and has 75 liters (2.65 ft3) bigger cargo space than BMW 8 Series (G15) (2020).
BMW 8 Series (G15) (2020) is 200 mm (7.87 inch) longer and 91 mm (3.58 inch) wider than BMW 3 Series Touring (2018).