BMW 6 Series Gran Turismo (2019) is 259 mm (10.20 inch) longer, 45 mm (1.77 inch) wider, 56 mm (2.20 inch) higher and has 207 liters (7.31 ft3) bigger cargo space than Buick Regal (2016).
Buick Regal (2016) is 120 kg (265 lbs) lighter than BMW 6 Series Gran Turismo (2019).