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Feel the intensity, not your equipment. Maximum image quality. Minimum weight. The new ZEISS SFL, up to 30% less weight than comparable competitors.

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Faer Out
I have had the EF 100-400mm f/4.5-5.6L IS II USM for about 3 months. I use it for birds with a 1.4 extender on a Canon 5Div.

This mark II no longer has push-pull.

It's a very good lens, the best zoom I've owned. It's heavy, and I use it on outings for several hours at a time without a tripod or monopod, but I survive. I try to think of it as exercise, but doing this does bother my back sometimes. I usually loop the tripod connector into my belt or a backpack waistclip in order to ease the strain on my neck and back.

It has good balance (I guess "feel"), has good IS, and can be used handheld and still get sharp photos.

I used to use Canon's 70-300, but this is a very noticeable step up and worth the investment in my mind.
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