To each their own! I went with the f4 IS for weight, price and sharpness. I generally ONLY shoot outdoors with it (chasing airplanes and cars) I find it even more fun now with the 5dmk3! Sure a 70-200 f2.8 L IS II would be amazing.. but Im not sure I want to drop almost 3k to lug around an almost 4lb lens for the benefit of an extra stop.
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