BMW 8 Series (G14) (2018) is 51 mm (2.01 inch) wider than Cadillac XTS (2014).
Cadillac XTS (2014) is 289 mm (11.38 inch) longer, 162 mm (6.38 inch) higher, 111 kg (245 lbs) lighter and has 159 liters (5.62 ft3) bigger cargo space than BMW 8 Series (G14) (2018).