BMW i8 (2015) is 1020 kg (2,249 lbs) lighter than Rolls-Royce Phantom Coupe (2016).
Rolls-Royce Phantom Coupe (2016) is 922 mm (36.30 inch) longer, 44 mm (1.73 inch) wider, 305 mm (12.01 inch) higher and has 240 liters (8.48 ft3) bigger cargo space than BMW i8 (2015).