Kia Optima (2018) is 250 mm (9.84 inch) longer, 274 mm (10.79 inch) higher and has 360 liters (12.71 ft3) bigger cargo space than McLaren 600LT (2019).
McLaren 600LT (2019) is 70 mm (2.76 inch) wider and 202 kg (445 lbs) lighter than Kia Optima (2018).