looks much better indeed, but you can lose a LOT of polygons on,, basicly everything. like the seat, you'll only need polygons for the edge to be smooth, since your seat is flat, normall they're not, but it saved polygons. same with the armrest.
and the tv screen on the back is not flat.. or is a cushion?
and good idea modeling the seatbelts, but I would rather put a seatbelt on the texture, and model the bottle and the metal thing instead, saves polygons, but if you model the whole belt, you´re gonna need way more poly´s to get it smooth
and is the cushion on the front not a little too small and round? take a look at some example pictures:
http://jetphotos.net/viewphoto.php?id=5788011&nseq=44
http://jetphotos.net/viewphoto.php?id=5918686&nseq=38
http://jetphotos.net/viewphoto.php?id=6338621&nseq=13