Audi S8 (2014) is 143 mm (5.63 inch) longer, 48 mm (1.89 inch) wider and has 5 liters (0.18 ft3) bigger cargo space than BMW 5 Series Gran Turismo (2017).
BMW 5 Series Gran Turismo (2017) is 91 mm (3.58 inch) higher and 1079 kg (2,379 lbs) lighter than Audi S8 (2014).