Audi RS 5 (2017) is 39 mm (1.54 inch) wider, 944 kg (2,081 lbs) lighter and has 5 liters (0.18 ft3) bigger cargo space than Rolls-Royce Phantom (2016).
Rolls-Royce Phantom (2016) is 1120 mm (44.09 inch) longer and 266 mm (10.47 inch) higher than Audi RS 5 (2017).
