Audi S8 (2016) is 141 mm (5.55 inch) longer and 54 mm (2.13 inch) wider than BMW 5 Series Touring (2018).
BMW 5 Series Touring (2018) is 97 mm (3.82 inch) higher, 1093 kg (2,410 lbs) lighter and has 65 liters (2.30 ft3) bigger cargo space than Audi S8 (2016).