In a dark room, the G20 and S2 are very close. The S2 has a gray front filter that, if you watch tv in a bright room, won't be very helpful. On the display wall at Best Buy, the S2 sticks out like a sore thumb with it's filter. The image gets grayed out a little. Hopefully they'll use a newer neopdp panel and use the G20 filter on next year's S3.
At home, though, or watching movies or tv in a dim or darkened room, it's excellent.
These are basically the same panel, one with THX a black front filter and some apps, the other is sort of barebones, extra sheet of glass, and a gray front filter.
Black level is the same or marginally different, as in, not making the slightest bit of difference.
They both still have the awful floating blacks, which can drive you nuts when doing critical viewing. I don't think you'll mind. You have to be very picky for it to really bother you.
"If you weren't such an ignorant troll, you'd be adorable" -rogo