u/Fine_Cranberry7056

I currently use an OM-D E-M10 Mark IV and Olympus 75-300 for wildlife, mostly birds. I’m wanting to eventually upgrade both body and lens to OM-1 Mark II and OM 100-400 II, but I will need to buy one sometime this year and the other sometime next year. Whichever I buy first I will pair with my existing gear. I’m wondering which one will give more bang for my buck? I believe the OM-1 Mark II is the better upgrade because it has stronger AF. Am I correct or would the 100-400mm lens on my E-M10 Mark IV be a more noticeable improvement?

I’m having a hard time with birds in flight on current setup, but I’m enjoying the challenge and going out for lots of practice.