Kia Optima (2015) is 440 mm (17.32 inch) longer, 120 mm (4.72 inch) wider and has 125 liters (4.41 ft3) bigger cargo space than Subaru Impreza GP (2014).
Subaru Impreza GP (2014) is 5 mm (0.20 inch) higher and 150 kg (331 lbs) lighter than Kia Optima (2015).