Just like Dave, I always have my 100-400II with me on at least one of my bodies. It's super versatile with excellent image quality. I sold off my 300 f4 a long time ago. However, I will say since getting the 5DIV I have been using my 300 2.8 with a 2X on it as a light weight (comparatively!) 600mm setup and have gotten some really great results, and that is with the V1 300, not the newer model.
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