BMW 5 Series Gran Turismo (2016) is 104 mm (4.09 inch) longer, 39 mm (1.54 inch) wider, 104 mm (4.09 inch) higher and has 30 liters (1.06 ft3) bigger cargo space than Buick Regal Sportback (2018).
Buick Regal Sportback (2018) is 173 kg (381 lbs) lighter than BMW 5 Series Gran Turismo (2016).