I pointed to that lens, because it is literally the ONLY long lens that is sharp enough to make a difference (I.e. the sharpest big white ever made). On the EF100-400 L II, the R5 with a 1.4 TC is as good or better in every respect when compared to a 90D without the TC and when you add the TC with the 90D, the lens doesn't hold up the resolution of the camera, so there is not enough gain to make a difference. The situation is similar with the 80mmL. I have and use all of the above and the R5 is at this point my camera of choice. The 500 L II is good enough with the 1.4 TC that the 90D might show some advantage, but then there is always the 2x TC. In the end, getting rid of the f/5.6 AF limit imposed by SLRs changed the game. You really have to spend some quality time with an R5 to understand how things have changed.I think your suggestion that most 7DII owners also own a 500/4 is half-baked.
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