BMW 4 Series (2013) is 157 kg (346 lbs) lighter than Buick Regal Sportback (2018).
Buick Regal Sportback (2018) is 262 mm (10.31 inch) longer, 37 mm (1.46 inch) wider, 93 mm (3.66 inch) higher and has 25 liters (0.88 ft3) bigger cargo space than BMW 4 Series (2013).