Not sure if it has been posted before, but here is a link to a polish site with test shots ranging from ISO 100-25600.
Canon EOS 70D + EF 50mm f/1.2L USM, JPEG with in-camera noisereduction off and lowest sharpening.
http://www.optyczne.pl/6029-nowo%C5%9B%C4%87-Canon_EOS_70D_-_zdj%C4%99cia_przyk%C5%82adowe.html
Same scene on the 60D and 7D further down on these links:
60D
http://www.optyczne.pl/140.9-Test_aparatu-Canon_EOS_60D__Podsumowanie.html
7D
http://www.optyczne.pl/114.9-Test_aparatu-Canon_EOS_7D_Podsumowanie.html
/Dar
Canon EOS 70D + EF 50mm f/1.2L USM, JPEG with in-camera noisereduction off and lowest sharpening.
http://www.optyczne.pl/6029-nowo%C5%9B%C4%87-Canon_EOS_70D_-_zdj%C4%99cia_przyk%C5%82adowe.html
Same scene on the 60D and 7D further down on these links:
60D
http://www.optyczne.pl/140.9-Test_aparatu-Canon_EOS_60D__Podsumowanie.html
7D
http://www.optyczne.pl/114.9-Test_aparatu-Canon_EOS_7D_Podsumowanie.html
/Dar