BMW 4 Series (2015) is 1064 kg (2,346 lbs) lighter than Rolls-Royce Phantom (2017).
Rolls-Royce Phantom (2017) is 1144 mm (45.04 inch) longer, 120 mm (4.72 inch) wider, 255 mm (10.04 inch) higher and has 8 liters (0.28 ft3) bigger cargo space than BMW 4 Series (2015).