This was tough for me. I voted for the 70-200 2.8 IS for your scenario.


I have the 70-200 2.8 IS and the 100-400. The truth is, if I could only have one I'd probably take the 100-400. It is just too versitle.


I usually don't find myself needing fast apertures at this length and the 100-400 gives a really sharp image, especially under 300mm.


I've actually been kicking around the idea selling my 70-200 and buying the 85 1.2 II, since I mostly use the 70-200 for portraits. It is tough giving up such a great lens. I just don't use it that much.