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I have the 100-400 too, but have been contemplating swapping to the 400 prime for my own reasons. It is hard to let go of the versatility of the zoom, though. The autofocus on the 400 is very fast, one of Canon's fastest and sharpest, noticeably faster than the 100-400.
Another consideration for me is the bokeh of the 100-400 is a little funky/odd for some reason. I'm on my iPad at the moment so can't post an image for example, but I definitely don't find it as appealing as the primes. Minor nitpick perhaps.
For the 100-400 is the versatlilty and compactness. Fits in bag quite well, less room than 400 prime too.
Sounds like I'm flip-flopping, doesn't it. I am, sorry. Been tossing up this decision for years, but every time I stick with the 100-400. Bottom line is that you'd be equally happy with either purchase. Perhaps another consideration for you would be what other lenses you have in the 100-300 range? If not much, go zoom?
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