Here is one review/ comparison I found. I do not know if this is from any brand-supported reviewers, so I cant vouch for any paid bias or not.
From Photography Life: Best Camera for Sports and Wildlife Photography in 2023
https://photographylife.com/best-camera-wildlife-photographyThe OM System is excellent for wildlife shooting and I know many who love it. We wont get into a debate into the image quality pros and cons of micro 4/3rds vs APS-C vs Fullframe. Use the format that suits your image quality needs and be happy.
Full disclosure, I have used APS-C and fullframe for my wildlife shooting in the past, and I prefer fullframe image quality with high megapixel cameras like my 50mp Sony A1, and 61mp A7RIV, and fullframe E-mount lenses from Sony, Sigma, Tamron that can resolve those high megapixel sensors.
However you would not go wrong to go to the superb OM System. You can make excellent photos with it, and save size and weight. Not sure how much money you will save in the long run with the best OM lenses, but that needs you to do further research .
If after doing your research you find the OM system is best for you, go for it and be happy.
Cheers and best to you all.
Here is one review/ comparison I found. I do not k... (