... I feel for me the 800 ISO and maybe even the 1600 are likely to be usable up to a certain size.
I am disappointed with the GRDiii's ISO 1600 stuff. Way too much noise. Haven't compared it to the GRDii because I don't care too -- won't be shooting there.
The ISO 800 may be usable in some situations. I think with the right match of post processing NR it could be ok.
Something that blew my socks off -- the mixed light metering whatever they call it. Shooting at night, florescent, incandescent, and fireworks ... and the images are as if lit by similar color light sources. :thumbs: I have no idea ... voodoo, maybe?!?
Oh, and long exposures -- out to 1-sec or 2-sec, are very, very, very usable!!! :thumbs: Haven't had the need to go longer than that, yet.