Audi A8 (2017) is 166 mm (6.54 inch) longer, 45 mm (1.77 inch) wider, 113 kg (249 lbs) lighter and has 5 liters (0.18 ft3) bigger cargo space than BMW 5 Series Gran Turismo (2015).
BMW 5 Series Gran Turismo (2015) is 86 mm (3.39 inch) higher than Audi A8 (2017).