BMW 8 Series (G15) (2018) is 2 mm (0.08 inch) wider and 61 kg (134 lbs) lighter than Kia K900 (2017).
Kia K900 (2017) is 252 mm (9.92 inch) longer, 145 mm (5.71 inch) higher and has 30 liters (1.06 ft3) bigger cargo space than BMW 8 Series (G15) (2018).