Time to poke the bear. Today I posted a long article on the telephoto options available on the Z system cameras. Thanks to my teaching assistant, Tony Medici, for his help in running all the tests necessary to come up with some valid conclusions based upon empirical evidence.
Don't like reading my long-winded articles? Okay, don't bother clicking through, just read this: there is no bad option between 200mm and 800mm in the current lineup, even using teleconverters. Okay, you didn't believe that, so you'll have to read the article after all ;~).