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I have read that the new 100-400L IS II is very sharp. It's smaller aperture should work outdoors in the stronger light.
https://www.lensrentals.com/blog/2015/08/canon-100-400-is-ii-mtf-and-variation-tests/

As Joel mentions, the Tamron 70-200 G2 is pretty good
https://www.lensrentals.com/blog/20...-new-tamron-70-200-f2-8-sp-di-vc-usd-g2/

Have you missed shots with your current setup due to the 7D's autofocus that would lead you to want a different body? Wonder if you could rent the 7DII and see if it enough better?