I second Roy's comment.I have both the 400F5.6 and the 100-400 .Since I acquired the 400 prime ,I have not used the latter.I am not the steadiest of people,but have not found the non IS a problem as the lens is so light and fast.But I have found that when focussing the single red dot(light) must be on the subject for accurate AF.
If yo need even extra length why not consider the Tamron 70-500 zoom.I think that is the one.I have seen some superb shots taken with this lens by "DOC" on BF.It is a very reasonable price and not too heavy.
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