Yea but the grain structure of red @ 320 ASA is like my 5D at ISO 100. SCrew it crank it up to 640, and its still clean......
Though nothing is as pristine as a 5D @ ISO 50. ITs just sick....
Seriously, though. Add to the fact that you can do it in REDCine instead of in-camera and it's even better. Gotta love a clean image.