BMW 8 Series (G16) (2020) 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 (2016).
Buick Regal (2016) is 76 mm (2.99 inch) higher and 234 kg (516 lbs) lighter than BMW 8 Series (G16) (2020).