As an owner of a Zed, I can't really say much about the quality of leather in cars lol
I've driven a 6, and it was fantastic. Really smooth engine, bags of grunt and it felt like I could throw it around corners as much as the ZR, and for a big saloon that's damn impressive.
I think style wise for me, the arse is too high! I'd like to see a sportier version, slightly lowered, something done with the bottom of the front bumper (Seems to angle up from the front wheel - looks strange to me, the whole car overall angles down from rear to front, but the lower front bumper profile angles up?)
I honestly think it's a great car, just in need of a better engine for 2012, and a few minor styling tweaks
Edit, And I don't like the light clusters for some reason. Look a bit "That'll do". Lights tend to define a model range, the MG 6's are a bit bland