GMC Sierra 2500HD (2014) is 860 mm (33.86 inch) longer, 172 mm (6.77 inch) wider, 499 mm (19.65 inch) higher and has 1278 liters (45.13 ft3) bigger cargo space than Kia Optima Sportswagon (2017).
Kia Optima Sportswagon (2017) is 1203 kg (2,652 lbs) lighter than GMC Sierra 2500HD (2014).