I just downloaded the high ISO images from DPR. All the images were taken at 3EV, so they are real low light images.
On my screen, I could see the noise at ISO 102400, but the 8.5 X 11 prints were sharp and clean. I then printed 3 more, 51200, 25,600, 12800, and they also suprised me. I could show any of these prints to someone, and they would not suspect that they were high ISO unless they had a magnifier.
These were jpegs with no additional processing by me, I would expect RAW to be better.
I certainly plan to use the ISO 25600 freely whenever I absolutely need it in low light for a fast shutter speed.
Canon has done some real work on the blacks, I can move the black slider in LR4 all the way to the right without seeing any banding.
yes they look more then okay!
thanks for sharing!