GMC Sierra 2500HD (2017) is 845 mm (33.27 inch) longer, 175 mm (6.89 inch) wider, 506 mm (19.92 inch) higher and has 1278 liters (45.13 ft3) bigger cargo space than Kia Optima Sportswagon (2020).
Kia Optima Sportswagon (2020) is 778 kg (1,715 lbs) lighter than GMC Sierra 2500HD (2017).