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Anonymous
Why not borrow your friends 70-300 and see if it does what you want it to? Then rent the 70-200 and see how you feel about it. Both have tradeoffs. The 70-300 is a significantly longer, but slower lens, but the 70-200 has undisputedly higher image quality (though not everyone has skills to take advantage of that higher quality) - to say nothing of significantly higher cost.
Test them both and see which one is right for you. There is no situation in which I would get the 70-200 f/4. If you are going to accept the loss of more than an f-stop, don't accept the loss of 100-mm in reach as well. FWIW, I have the 70-300 f4-5.6 IS - and I am very happy with it. The IS does work, and largely makes up for the difference in aperture size.
Remember that while some people get very snotty about L series glass, that both lenses are Canon glass - neither one is going to be junk.
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