GMC Yukon XL (2021) is 865 mm (34.06 inch) longer, 197 mm (7.76 inch) wider, 478 mm (18.82 inch) higher and has 2146 liters (75.78 ft3) bigger cargo space than Kia Optima (2015).
Kia Optima (2015) is 1010 kg (2,227 lbs) lighter than GMC Yukon XL (2021).
