 Compared BMW 328, MB 300, Audi A4, and infiniti g37x to the KIA SX. Optima SX had more options and performance. Theoptima is a gorgeous car. the outside styling and paint finish is incredible. Interior materials are excellent quality. The navigation and radio respond very quickly. Front and rear seats are heated. I have had the car for a month, love how it drives and handles. The SX turbo flies with almost 274HP. this is my 3rd kia. They have been extremely dependable. There is nothing on the market that has the same value as a KIA. This is not the KIA of past. Toyota and Honda take note. I traded out of a m35x for the SX. The m35x was very expensive to maintain almost $12k a year. 