Audi Q8 (2018) is 12 mm (0.47 inch) wider, 111 mm (4.37 inch) higher, 415 kg (915 lbs) lighter and has 550 liters (19.42 ft3) bigger cargo space than Rolls-Royce Phantom Coupe (2015).
Rolls-Royce Phantom Coupe (2015) is 613 mm (24.13 inch) longer than Audi Q8 (2018).