BMW 8 Series (G16) (2019) is 251 mm (9.88 inch) longer, 75 mm (2.95 inch) wider and has 38 liters (1.34 ft3) bigger cargo space than Buick Regal (2015).
Buick Regal (2015) is 76 mm (2.99 inch) higher and 219 kg (483 lbs) lighter than BMW 8 Series (G16) (2019).