It's great to have a stickied summary of rumored lenses, but the first post hasn't been updated in over two years. Could we find another volunteer to take over maintenance and updates, or unsticky this post to prevent confusion?
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I didn't need IS with my FD 50mm f1.4, and I don't need it now, especially for the extra $400 over the current lens....
Noise: The 6D is about 1.5 to 2 stops better than the 60D. I find I can shoot at ISO 3200 and get results that look as good as ISO 800 on the 60D. And ISO 400 is just as good as ISO 100 on the 60D - which means I can shoot at ISO 400, and set my shutter speed 2 stops faster - which is great for action shots. Also when I say 2-stops better that's comparing the amount of noise I see in RAW files. However the real world advantage is actually a little better since with more detail you can apply more NR and still keep the minimum required detail for most applications.
AF: I'm finding the AF on the 6D to be very good, it's at least as fast as the 60D to lock focus, and clearly faster in low light. However my understanding is that the 7D has a great AF system for tracking moving subjects which are off center. So if you are finding you use the tracking AF a lot, and/or are using the points far from the center of the frame, you may want to keep the 7D for that. I find that with tuning, you can make the 6D's tracking fairly good, however you have to keep your subject near the center of the frame.