Kia Optima (2015) is 275 mm (10.83 inch) longer, 64 mm (2.52 inch) wider and has 170 liters (6.00 ft3) bigger cargo space than Subaru Impreza WRX (2015).
Subaru Impreza WRX (2015) is 10 mm (0.39 inch) higher and 11 kg (24 lbs) lighter than Kia Optima (2015).