Hot and humid here in NH today, so a few more tests. Perhaps not perfect, but I am seeing enough to reach my conclusions.

First, the bokeh test. I am curious about the framing of the M6 II with the 500 at f/4 or 800 mm equivalent framing vs the 5DIV + 1.4x TC which would have a maximum aperture of f/5.6 and 700 mm equivalent. At my feeder, this is what I am finding I am using, the M6 II with the 500 f/4 bare or the 5DIV with the 1.4x TC.

Perhaps I should have done this in the morning when the background would be better lit, but I am seeing enough.

5DIV
Name:  TDP 5DIV Bokeh-9713.jpg
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M6 II

Name:  TDP M6 II Bokeh-9126.jpg
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5DIV
Name:  TDP 5DIV Bokeh-9714.jpg
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M6 II

Name:  TDP M6 II Bokeh-9127.jpg
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I think both are very good and pleasing and am happy with either, but I am finding better bokeh with the M6II at max aperture of f/4 with no TC vs the 5DIV with TC at max aperture of f/5.6.