BMW 7 Series (2017) is 81 mm (3.19 inch) longer, 35 mm (1.38 inch) wider, 17 mm (0.67 inch) higher and has 110 liters (3.88 ft3) bigger cargo space than Buick LaCrosse (2018).
Buick LaCrosse (2018) is 217 kg (478 lbs) lighter than BMW 7 Series (2017).