BMW 3 Series Touring (2017) is 90 mm (3.54 inch) higher, 169 kg (373 lbs) lighter and has 145 liters (5.12 ft3) bigger cargo space than BMW 8 Series (G14) (2019).
BMW 8 Series (G14) (2019) is 200 mm (7.87 inch) longer and 91 mm (3.58 inch) wider than BMW 3 Series Touring (2017).