The answer is obvious on paper!
But, from a practical point of view...
I took the ZF to Argentina last year with the Tamron 150-500 and I was very happy with how it performed. I had the small primes for when we were in Buenos Aires, which is where the ZF really shines for me, but knowing we were then heading into the countryside, and wanting to capture some images of the different birdlife I packed the Tamron. From large raptors to tiny Hummingbirds it did admirably. I don't do a huge amount of wildlife, being mostly travel, street, events, etc, but it's nice to be able to do a little when the opportunity arises. It would have probably been easier on the Z6iii, what with all the extra function buttons and such, but I don't think the images would be any better. I really like what comes out of the ZF.
