Kia Optima (2018) is 515 mm (20.28 inch) longer, 170 mm (6.69 inch) wider, 65 mm (2.56 inch) higher and has 170 liters (6.00 ft3) bigger cargo space than Subaru Impreza GJ (2015).
Subaru Impreza GJ (2015) is 340 kg (750 lbs) lighter than Kia Optima (2018).