BMW 6 Series Gran Turismo (2020) 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 (2014).
Buick Regal (2014) is 130 kg (287 lbs) lighter than BMW 6 Series Gran Turismo (2020).