Drove a Kia K900 for a week, AMA!
Closest would be a new bmw 3 series. It was very quiet, and the interior had comparable fit and finish. The BMW has always been more of a drivers car, and that was evident with the Kia's slower clumsier shifting. I would imagine the Kia is marketed more towards the luxury cruiser than the sports sedan. I.e. I managed to over heat the brakes with a short stint of hard driving.
For the price, you get a lot more options on the Kia, the headlights turning around corners works suprisingly well.
The other thing, for good or bad is it doesn't quite look like a $60,000 car. Everyone knows a BMW is a luxury car, but the Kia badge lets it slip by others.