BMW 3 Series Touring (2015) is 90 mm (3.54 inch) higher, 388 kg (855 lbs) lighter and has 145 liters (5.12 ft3) bigger cargo space than BMW 8 Series (G14) (2020).
BMW 8 Series (G14) (2020) is 201 mm (7.91 inch) longer and 91 mm (3.58 inch) wider than BMW 3 Series Touring (2015).