I currently have two 5D Mark IVs that I have had since the body came out. I love the camera, but have always had difficulty with the autofocus on a moving target, like birds in flight. I primarily shoot landscape and wildlife. I am considering moving to the new mirrorless line, not because of weight, but because I understand that the autofocus system is more refined. I have quite a bit invested in EF lenses and do not plan to purchase any RF lenses any time soon. So my questions are:
1) What specifically are the advantages of the R5 (or new R3) over the 5DIV that will help with the above?
2) Will I be able to use all of my EF lenses on the RF adapter, including the 1.4XIII and 2.0XIII extenders?
I know there will be a substantial cost difference when the R3 comes out, but would it be worth it to wait for it? I will not say that cost is not an issue, but it is not the primary driver. I had planned to keep these two bodies for some time longer, but have just never been pleased with the focusing.
Anybody with experience in upgrading bodies would be greatly appreciated!
Scott


