Try a D3s then, another stop or 2 on top of the 5d!
I swear this forum is poluted by anti grain folk. You'll miss some of the most amazing moments you'll ever take worried about grain!
Love the grain!!
Glad you enjoy your 5D mate. Lets see some video huh? No one seems to post much on that front.
Depends on the grain. In general, digital grain is nothing compared to B&W film grain.
I may be biased but some Nikon Camera are known for making "nice" digital noise/"grain" since Nikon try to remove chroma noise which is visually disturbing and leave some of the luminance noise to keep details. Some of this noise is fine, depending on the end product of the photo. For some things noise is ok, for other uses even slight noise is disasterous.
Also I never really found the 5DII that special ISO wise. It wasn't better than a 1DIII! [nor the 1DsIII].
Try a D3s then, another stop or 2 on top of the 5d!
1 stop maybe, but 2 stop? - doubt it.
The origional D3 was at least one stop better than the 5dmkII and the new 3Ds is unbeliebaly 1 stop better than the 3D