I know this an old thread but I will leave my experience here if anyone come across this thread .
I had the same concerns couple of months ago regarding 100-400mm + 1.4X or 2X extenders . I couldn't find a proper answer anywhere so I went ahead and bought 100-400mm cannon , Kenko 1.4 MC7 extender and Kenko 2x 300 PRO extender.
Here are some shots I took with above combos with 600D
100-400mm + 1.4 extender at 560mm , Hand held , Not post processed .
100-400 mm +2x extender at 800mm , With monopod , Sharpened with PS.
just like to say.. I ahve the lens and the new latest 1.4x I dont have the x2 ...its brilliant... f4 loverly shots..been using it a lot lately no problem..
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