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Hi Leon
I have used the Mk II x1.4 Extender with the 400mm F5.6L and under good conditions, I have been very pleased with the results.
My experience has been that I have to very mindful of good technique and need good conditions to get reasonable results. With the 400mm F5.6L at its native focal length I am confident of getting a reasonable set of keepers, but when I fit the x1.4 Extender my keeper rate goes down. In my opinion, this is due more to environmental conditions (thermals, poor seeing, etc.) rather than the quality/sharpness/contrast of the combo itself.
On all occasions, the 400/x1.4 combo has produced better results than just up-sizing the naked 400mm in post.
On those occasions when I have used it for day time (distant) bird photography, the image quality is usually affected adversely by ground/air currents rather than the lens/extender combo itself.
Here is a selection of photos using this combo.
Cheers
Dennis.
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