I have not upgraded yet to the 100-400v2. I use the 400mm f/5.6L, but I am a birder, and don't need 100-399mm. (I would like the much closer focusing of the 100-400v2 for butterflies and dragonflies). Lack of IS is a real issue, but one fix is to carry a monopod with tilt head. This can do double duty as a hiking staff, if you get the largest diameter monopod. It works fine as a staff for the very basic steadying across streams, muddy slopes, or clamoring over downed trees. A very few commercial hiking staffs come with 1/4" threaded bolt on the top, to which you could attach the head. If you are crafty and always shoot standing up, you could make your own staff. Then you learn how to use the monopod effectively. A collapsed monopod can be used sitting. You don't get the stability of a tripod, but it can help - I have taken pixel-sharp shots at 1/100 with the non-stabilized 400 on a monopod, and could likely do better than that. Anyway, the 400 f/5.6L takes some getting used to, but it is a great hand-held lens for birds in flight and other panning shots, given practice, and it certainly is light. Current price for good used copy is ~$900.00. I'd recommend this for a birder who is willing to spend some time tracking and shooting any-old-bird-in-flight. I have gotten technically excellent shots with this lens on my 60D.
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