Acura RLX (2016) is 139 mm (5.47 inch) longer, 126 mm (4.96 inch) higher, 139 kg (306 lbs) lighter and has 72 liters (2.54 ft3) bigger cargo space than BMW 8 Series (G14) (2018).
BMW 8 Series (G14) (2018) is 12 mm (0.47 inch) wider than Acura RLX (2016).