"Normal for LCD" is still a statement that is very much subjective and covers a pretty big range, as you can see from people saying there is 'none', 'little' and 'it's horrible'. So it really doesn't help people to just state one or the other. Even most reviews vary heavily but no review postet good pictures yet. I think that both the new Panasonic and Epson are about the best you can get today in terms of LCD + Cross-Talk + reasonable price but still would like to judge it as good as possible for myself. The cross-talk I've seen on every subtitle in AVatar in my little Preview certainly was very noticable and distracting, so if CInema 2 further reduces the effect that would be great to know/see (thanks @ WilliamG).
I haven't been to an IMAX-Theater recently but the regular theaters have improved massively in the last 2 years. I haven't seen any cross-talk whatsoever in my last 3-4 visits whereas I've seen quite some in the beginning of the 3D-hype. Also all our theaters, including IMAX, have passive systems and while I am not sure what they use as projection-system I was always thinking they use either 2 optical systems or a 3-chip-DLP-like design combined with passive glasses.