BMW 5 Series Gran Turismo (2016) is 173 mm (6.81 inch) longer, 44 mm (1.73 inch) wider, 86 mm (3.39 inch) higher and has 98 liters (3.46 ft3) bigger cargo space than Buick Regal (2017).
Buick Regal (2017) is 240 kg (529 lbs) lighter than BMW 5 Series Gran Turismo (2016).