Production 7D first look on dc watch
Full ISO studio scene comparisons to D300s, K-7 & 50D and a gallery.
Overall, my impression from this review is the noise grain is very well controlled up to 3200 and serviceable at 6400 for smaller prints. Even at higher ISO setting, fine detail is not smeared. The samples taken with new EF-S 15-85 IS looks very decent for a walk-around and the amount of CA is moderately low compared with EF-S 17-85 IS.
Viewed at the picture level, the high ISO performance and color definitely equals my 5D at 1600/3200 setting and is not worse than recent 1.6X crop sensor cameras, in fact there is some improvement.