BMW 8 Series (G15) (2018) is 50 mm (1.97 inch) wider than Cadillac XTS (2015).
Cadillac XTS (2015) is 289 mm (11.38 inch) longer, 160 mm (6.30 inch) higher, 107 kg (236 lbs) lighter and has 89 liters (3.14 ft3) bigger cargo space than BMW 8 Series (G15) (2018).