Thanks so much for weighing in on this Ken! Hm, I guess I'll just have to wait for that new battery to arrive and test it and see. I have done several controlled test shoots both indoors and out, with all my different lenses, but no matter where and how I shoot, it all comes out super noisy. I wish I hadn't sold my 20D, those images are crystal clear in comparison. Even my old Panasonic Lumix point and shoot (which I won in a contest) produced better quality images than my 7D does right now.
On a different note, the body I have been looking at for when I upgrade is a 5D Mark III, and it's nice to hear that you're still getting good results with the M1.