BMW 7 Series (2018) is 198 mm (7.80 inch) longer, 40 mm (1.57 inch) wider, 23 mm (0.91 inch) higher and has 44 liters (1.55 ft3) bigger cargo space than Buick Regal Sportback (2019).
Buick Regal Sportback (2019) is 160 kg (353 lbs) lighter than BMW 7 Series (2018).