A bit of background - I used to have a 1DMkII and 100-400mm L, but got sick of the small viewfinder and viewfinder blacking out so I sold it and got a Leica M8 for general type walkabout photos, effectively giving up on sports photography.

Fast forward 7-8 years and I’m keen to get back into it!!

It seems like mirrorless has come a long, long way and I really like the idea of no blackout EVF and all the other EVF features like auto-adjusting brightness etc. But I wonder how it compares against the old 1DMkII AF & tracking performance? Does anyone know? Anyone here use mirrorless for sports, and what do you think about it? Any regrets?

Cheer for any info!