Can new 70-200mm f2.8IS II replace 400mm f5.6+2x.ext for birding?

Started Oct 21, 2010 | Discussions thread
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georgec
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Can new 70-200mm f2.8IS II replace 400mm f5.6+2x.ext for birding?
Oct 21, 2010

I am considering trade my current 70-200mmf2.8IS and 400mm f5.6 for the new 70-200mm II+2x extender. Anyone compare the sharpness and the focus speed for birding/airshow? If it is as good, it will be more flexible to carry just 1 lens and handle different scenarios.
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Canon EOS 5D Mark II Panasonic Lumix DMC-GH3 Panasonic Lumix DMC-GH4 Canon EF 135mm f/2.0L USM Canon EF 400mm f/5.6L USM +8 more
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