BMW 8 Series (G14) (2020) is 50 mm (1.97 inch) wider than Cadillac XTS (2015).
Cadillac XTS (2015) is 298 mm (11.73 inch) longer, 162 mm (6.38 inch) higher, 116 kg (256 lbs) lighter and has 159 liters (5.62 ft3) bigger cargo space than BMW 8 Series (G14) (2020).