Acura RLX (2020) is 189 mm (7.44 inch) longer, 125 mm (4.92 inch) higher, 120 kg (265 lbs) lighter and has 2 liters (0.07 ft3) bigger cargo space than BMW 8 Series (G15) (2018).
BMW 8 Series (G15) (2018) is 12 mm (0.47 inch) wider than Acura RLX (2020).