Audi A4 Allroad (2015) is 156 mm (6.14 inch) higher, 233 kg (514 lbs) lighter and has 140 liters (4.94 ft3) bigger cargo space than BMW 8 Series (G14) (2018).
BMW 8 Series (G14) (2018) is 123 mm (4.84 inch) longer and 61 mm (2.40 inch) wider than Audi A4 Allroad (2015).