Yeah, YT makes it tough. The problem is, there are multiple "passes" when it comes to these kinds of videos. First, I capture it with screen flow and output it. Then I import it to Premier and output it for YT. Than YT may optimize it (I export in YT format from Premier, but who know what goes on behind closed doors at YT). Then, YT sends it to you and optimizes (compresses) the stream you watch.I have to be honest that I can rarely see a difference when these types of tests are done. Not sure if it's just my eyes or what You Tube does to the videos, or the resolution that I watch You Tube at so I have to trust your eyes and expertise on that front. I have the 100-400 and got my 180-600 last week. I've been impressed with both. I'm more of a landscape and sports shooter than most that are here. They both resolve the high MP of the Z9 extremely well in my mind and the short throw for the 180-600 is such a huge upgrade over the 200-500. Nice to have that extra 120mm in the range as well. Looking forward to taking the 180-600 out with 1.4 TC to capture some birds before they all fly south for the winter. Thank you for the review. You are one of the few on YT you can trust these days.
That's why I narrate
I did do this one in 4K though, so hopefully that helped a little