BMW X7 (2018) is 296 mm (11.65 inch) longer, 140 mm (5.51 inch) wider, 335 mm (13.19 inch) higher and has 310 liters (10.95 ft3) bigger cargo space than Kia Optima Sportswagon (2018).
Kia Optima Sportswagon (2018) is 629 kg (1,387 lbs) lighter than BMW X7 (2018).