Here is a basic comparison with 60Da on an FS 60, ISO 3200 42 minutes lights with calibration. Basic portrait auto mode, no processing at all. Then QHY 8 OSC camera 50 minutes on TSA 120 no calibration frames (sorry about gradient).
The astro shots have not really been post processed hence the defects but I thought you might like the raw look.
see them here...
http://www.flickr.com/photos/6119769...ted=7260890946
did it this way as the 60da file is huge and kept crashing my ancient lappy!
Hope this is useful. The 60da seems quite clean even at exif 21'c at high iso.
Cheers
Graham