I swapped my 7D for a 70D in august as I was fed up with the high ISO performance of the 7D. The 70D handles noise far better IMO than the 7D and I'm now happy to use the 70D in any situations. I also have a 5D3 that I use as my primary body and when I had the 7D the 5D3 was in use about 90% of the time. Now with the 70D I use the 5D3 about 60% of the time, I've started using the 70D for all my macro shots and most of my wildlife/aviation shots as well. I've just got a Canon 300 f4L IS and I tried that on the 70D the other day and I was blown away by the IQ of it, even with my Kenko Pro300 DGX 1.4x converter on it was still fast to focus and gave a great IQ too.