Acura RLX (2015) is 39 mm (1.54 inch) longer and 23 mm (0.91 inch) wider than BMW 5 Series Gran Turismo (2018).
BMW 5 Series Gran Turismo (2018) is 3 mm (0.12 inch) higher, 85 kg (187 lbs) lighter and has 108 liters (3.81 ft3) bigger cargo space than Acura RLX (2015).