BMW 5 Series Gran Turismo (2018) is 5 mm (0.20 inch) wider than Buick Regal TourX (2018).
Buick Regal TourX (2018) is 43 mm (1.69 inch) longer, 15 mm (0.59 inch) higher, 17 kg (37 lbs) lighter and has 70 liters (2.47 ft3) bigger cargo space than BMW 5 Series Gran Turismo (2018).