Makes sense, Anjin. For me, I'm on a 20 year mission to photograph backyard birds from my deck, and can lug an 800mm there from my office. For travel, I too would need a Sherpa, or a future Z 600mm PF . On the 800, my issue is deciding between Z 800mm PF or the 800mm f/5.6E FL ED VR. Given the short drag-lens-to-the-deck distance, I could do the F-mount tele King, which seems to offer a noticeable optical benefit. Am currently sizing up the cost of that used vs a new Z 800.I personally would love to have the 800PF…but I need a Sherpa if I had one and my wife won’t. The issue is that unless you’re only interested in a particular subject when you go out it just isn’t flexible enough because of the length…and taking another lens along with it makes the Sherpa problem worse. Down here in SW FL…it is just too much tech for most of what I do…and taking something that big on a hike for 10% of my shots that day is too much. Most of the places I go 600 is fine and allows me to carry another lens for closer targets. I don’t do blind shots where it would be more easily used…
However, this thread is about the Z 600mm f/6.3. For Sherpa-less travel, I'm getting excited to give it a try!