I'll 2nd that. I'm very excited about all of the innovations in HD/2k/4k capture and exhibition, and by the time my feature-length directorial debut comes together it will probably be on one of these formats instead of film, but with the dynamic range being what it is, you can totally tell the source format of things when you're looking at a film print. When I saw Zodiac in theaters, as well done as the photography was, it was clear that the blacks were very crushed, and low light scenes were noisy (is it me, or is the Viper noisier than the Genesis or other HD cameras?), suggesting video capture.
Generally, I don't think it's very useful to expect HD to "look and act" like film, quality photography is about understanding the limits and advantages of your tools and maximizing.