My partner has Sony 200-600 on Z9 and he adores it.
We were shooting European Bee-eaters, they just arrived, choosing partners and holes and sometimes fighting for the holes. They are very dificult to photograph, I mean BIF+fight in the air. I took about 4000 shots with Z9+ Z100-400 for just to get those fighing shots and I am not really happy with my results. But my partner got the shot! He said also that he was extremely happy to have this combination of Sony 200-600 and Z9. He also has Z 800mm and he said that AF on 200-600 is faster than on Z800.
Earlier, for other post we made a AF test of 200-600 on Z9 and 100-400 on Z9 and as far as I remember 200-600 was a bit faster. But the AF target was about 5-6m away. So we did the test as following: two Z9 cameas with diffrent lenses focused on the same target and then defocused (one time further and one- closer) Then both were focused and this was recorded with iPhone becasue otherwise it is difficult to see which camera+lens is faster. Only if we re-play the recorded video in half-a-speed we can see the difference.
We have 1,4TC. If somebody is interested then we can repeat the test with target further away (10m, 20m) I think, I will repeat it just becasue I am curious. I have also 500 PF and 150-600 Sigma. I also used the same focal lenght for testing. So if I test 100-400 against 200-600 then I used 400mm on both.
I hink, it is correct so?