BMW 5 Series (2016) is 7 mm (0.28 inch) longer, 8 mm (0.31 inch) higher and has 90 liters (3.18 ft3) bigger cargo space than Buick Regal Sportback (2018).
Buick Regal Sportback (2018) is 3 mm (0.12 inch) wider and 98 kg (216 lbs) lighter than BMW 5 Series (2016).
