I changed from the 80D to the Canon R7 this year and changed from the EF 75-300 Mk I to the Mk II. I had some focus issues sometimes with the old setup. The R7 is better in that regard as is this lens. Still can't quite pull the trigger on an L series lens.
I don't find I use more than about 200mm of the zoom most of the time as you aren't that far away from the track. My buddy carried his 600mm zoom around all weekend but barely used it.
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