GMC Yukon XL (2021) is 865 mm (34.06 inch) longer, 197 mm (7.76 inch) wider, 473 mm (18.62 inch) higher and has 2146 liters (75.78 ft3) bigger cargo space than Kia Optima (2017).
Kia Optima (2017) is 995 kg (2,194 lbs) lighter than GMC Yukon XL (2021).