unseen said:http://digitalcamera.impress.co.jp/06_02/auth/toku1/index_iso.htm
You get to see noise performance here.
Check out Pentax's ?ist DS2. It performs as well as Canon's 5D at ISO1600. Perhaps even better.
sorry but all the Olympus dSLRS are so far behind in ISO performances that I believe some PnS (Fuji's notably) may perform better. I mean, my 350D ISO1600 outperforms the E500 ISO400 at noise cleaniness.
This I feel is TOTALLY wrong. I had a F11 and I can safely say the F11 is FAR from the E1. Anyway, I believe your conclusion for ISO performance is just the level of noise... you should always LOOK at the amount of detail. I have taken the ISO1600 samples from the site and ran neat image through all of them and cropped a 100% sample where there are details.
http://forums.clubsnap.org/showthread.php?p=2192065#post2192065
Look at the canon 5D as a reference as it is far better than all the rest. The canon 350D is a close second. The pentax which you say is as good as the 5D, I feel is probably last in details.... maybe nikon D50 (another "low noise" performer) is worse for details.