GMC Sierra 1500 (2014) is 366 mm (14.41 inch) longer, 172 mm (6.77 inch) wider, 397 mm (15.63 inch) higher and has 1288 liters (45.49 ft3) bigger cargo space than Kia Optima Sportswagon (2017).
Kia Optima Sportswagon (2017) is 275 kg (606 lbs) lighter than GMC Sierra 1500 (2014).