Audi A8 (2014) is 131 mm (5.16 inch) longer and 53 mm (2.09 inch) wider than BMW 5 Series Touring (2018).
BMW 5 Series Touring (2018) is 105 mm (4.13 inch) higher, 84 kg (185 lbs) lighter and has 196 liters (6.92 ft3) bigger cargo space than Audi A8 (2014).