BMW 5 Series Gran Turismo (2019) is 43 mm (1.69 inch) longer, 5 mm (0.20 inch) wider, 23 mm (0.91 inch) higher and has 60 liters (2.12 ft3) bigger cargo space than Buick Regal Sportback (2020).
Buick Regal Sportback (2020) is 17 kg (37 lbs) lighter than BMW 5 Series Gran Turismo (2019).