ive been reading a lot of reveiws of different cameras lately and with the recent talk of the 7DII , i decided to take a few test shots with my 70D.
i asked mr squirel to model for me and he said sue lol. i found that if you can fill the frame and dont need to crop , it works fine all the way up to 12800 ISO . of course there is noise in the background but its not real bad. i have read where you can aply a gausian blur to the background to mask some of the noise but havent figured that part out yet lol.

ISO 3200
ISO 3200 by sedwards679, on Flickr
ISO 6400
ISO 6400 by sedwards679, on Flickr
ISO 12800
ISO 12800 by sedwards679, on Flickr