I have to say, my BMW Comfort Seats are more adjustable and more comfortable than the Karma's seats. No matter how I adjust the seatback, my shoulders never feel quite supported as much as I'd like. Even so, I'd *much* rather drive the Karma!
I think the driver ergonomics in the Karma is perfect for me. I rest my arms on the door and center console and my feet are at the same level. And, the fat steering wheel feels nice. It is a perfectly comfortable position.