Hi Chris,
Great choice on 2 counts.
I have a 70-200 F2.8 non IS and it is tack sharp through the range. Great for the kids sport (among other things).
I also have the 24-70. I was never happy with its sharpness and recently it failed to get even close to focus. Sent it back to Canon and they replaced 3 spacers. $45 for the parts and $350 for labour. When asked why they needed replacing I was told wear and tear! Interesting as I rarely used it. I still think the focus is not tack sharp and it lacks a bit of contrast.
Well done.
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