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I borrowed one from a fellow astronomer on a dark sky night a couple of months back. I tried a bunch of shots wide field.
My comparison was my 7D taking shots on the same night. I did a bunch of shots but the most direct comparison was with the 8-15 F/4 L fisheye on the east hemisphere at the time (jupiter - orion - LMC).
I was not blown away by the 60Da. My enthusiasm was much more lacklustre than I expected. Yeah, a bit of different, Barnard's loop more obvious so would require less exposures with the 60Da, obviously in the red nebulosity, but I went away from the night basically forgetting about the camera. I didn't think the 60Da would get me a winning shot where the 7D wouldn't have, and that's how I think about these such purchases. It's only your post which made me remember that I tested the camera.
Recently I had been thinking down the exact same lines I think you are. Wide field for more detail - modified DSLR or camera lens on an astro CCD or such to punch out more detail in shorter time. The 60Da didn't really come back to mind. Other cameras like the 6D and 5DIII have. 8300C + lens got written off on poor sensitivity reports.
I can dropbox RAW's from the night if you want. PM me if so.
Roger.
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