BMW 8 Series (G14) (2020) is 247 mm (9.72 inch) longer and 104 mm (4.09 inch) wider than Buick Excelle GT (2015).
Buick Excelle GT (2015) is 124 mm (4.88 inch) higher, 708 kg (1,561 lbs) lighter and has 55 liters (1.94 ft3) bigger cargo space than BMW 8 Series (G14) (2020).