I just came back from a photo exhibition. I played with the new Canon 5D mkIII (with 24-70 I and 70-200 II) . I shot some portraits from iso 1600 all the way up to 25600. I was impressed!
Here I uploaded 2 100% crops at iso 1600 and 25600. Sorry for not uploading the whole image but the model (my dad) is not very comfortable about it ;D
I also played with Canon G1X but didn't have an sd card to save the files..