Yeah, the X-T10 is temporary for me. I have an order in for X-Pro2, but, if it doesn't ship out by the end of March I will probably just cancel and wait for the X-T2 which is really what I want anyway, even if it's nothing but a sensor update (though I do believe it will be significantly more change than that.)
X-T10 does okay, if there are any performance issues using this lens, though, I have to assume they primarily come from the X-T10's weak processor. The small buffer doesn't do any favors for shooting animals, either.
I mainly wanted to get out and shoot a bit of my own tests since most of what I've seen so far are—whether the shooter knows it or not—extreme torture tests for long lenses, with a lot of atmospheric garbage mucking up shots and slight misfocuses which really mess with long lens images, particularly when a teleconverter is involved.
Most of what I got that wasn't involving a very distant subject is printable 18x12 easily, and that's without any editing.
At any rate, I look forward to using this lens with a better camera someday.