the 5D2, with Flaat_12p, has 11.5 stops of DR, and seeing this I'd rate it at "definitely useable":
(yes, the aliasing/moire is horrible; 5D3 fixes that, but we're talking about DR now, and in that respect it's defninitely not an improvement)
the D800 has even more DR: Flaat_13p seems good enough with minor denoising in post, and is delivering 12.7 stops of DR
the best camcorders at these prices can give you very clean images, but they look decidedly video-y and have much more limited DR (I haven't been keeping up with that market, but I'd guess around 9 stops?)
step up to $5K (or wait for the BMC), and you've got the best from both worlds
but you can buy a lot of K-01 bodies for that price...