There's a very nice little short piece made on a Canon D-SLR that makes me think it's ready as an HD shooting technique. Looks nearly as nice as a Red - more photographic than filmic, but that may be down to the maker.

Reverie

Personally, if I was making corporate video, I can't see why I wouldn't work in HD now. That's probably a good thing for most of us, but needs some thought - no sense bringing SD players any more, and we know they aren't going to make tapes. Still, it looks great.