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 1175 liters (41.49 ft3) bigger cargo space than Kia Optima Sportswagon (2015).
Kia Optima Sportswagon (2015) is 440 kg (970 lbs) lighter than GMC Sierra 1500 (2014).