The demo car I looked at back in November used a different plastic material than my G. I remember taking a second look at the demo after placing my order and thinking about how porous the material looked, and how concerned I would be about it scratching. I don't know, maybe this is what ends up in the base model (I have Premium).
Anyway, the materials used in the production car are very nice (as far as plastic goes), and I don't have any problems with getting scratches.
A number of people have been in my G after looking at the Z. Everyone of which has commented on how much better, and more refined the interior is.
In the end though, it all comes down to personal choice.
Oh, one absolute fact though......I have NEVER been in a more comfortable driver seat (including my S500). The leather "feels" great, and it fits incredibly well for my 6'6" frame.
Headroom....now that's another issue.
peace