I've been going to take the plunge for months and move up to a 50". I eventually ordered a G20 this week. It hasn't arrived yet, so I can't really say. But I didn't like the look of the G10 at all. Not all that fussed about the slightly rounded bottom on the G20 but I think I'll learn to live with it. I did see a G10 and a G20 (both 42") in a shop next to each other. The picture on the G20 did look slightly better (HD source). Any comments I've seen all say it's a better telly, motion better and better colours. Also it has more features, some of which are a good thing (!).
I'm goona kick myself when prices come down but hey I'm looking forward to it arriving