I'm considering getting a new lens, a 70-200mm. But I don't know which one to get. Obviously I would be getting the Canon EF 70-200mm f/2.8L IS USM II if I had the money, but I don't so I am forced to compromise... So instead I'm looking at either the Canon EF 70-200mm f/2.8L USM or the Canon EF 70-200mm f/4L IS USM, and I am looking for the best overall image quality. Thus my considerations have been as follows: With IS I will be able to shoot better handheld, especially at long ranges. With f/2.8 Bokeh will be better. With f/2.8 I will obtain better shutter speeds, but not enough to counter the lack of IS. With f/4 fast moving objects will become blurry. Did I miss anything? Which one would you, in my situation, get? Things not to factor: Weather sealing/quality is not important. Size is not a huge ordeal as I have plenty of room let in my bag. Weight is not an issue.