I made the switch last year from Nikon, which I had used for many, many years, to Sony. Why? In a word: lenses. I was ready to move to full-frame mirrorless and I knew what I wanted, starting with a macro lens, and, oops, Nikon at that point didn't even have a macro listed on its "roadmap," much less one I could pluck off the shelf at a store or order online. Ehhhh? Nikon's answer to that: "just put one of your old lenses on our FTZ adapter." Uh, no thanks. Why should I sit around waiting for Nikon to cough up a native macro lens and a long lens or two when I could go to the camera shop and immediately purchase exactly what I wanted when I wanted it? There were other factors, too, which entered into the decision, but that was a major one. So, I went to the store and traded my Nikon gear, coming home with not only a new body but two -- count 'em, two! -- macro lenses plus a third lens. About a month and a half later I returned to the store and purchased a long zoom (200-600, the Bazooka), and then in the spring purchased another long lens (100-400). Last I looked, people who are using Nikon's Z system are still waiting for the one native macro lens and a long lens.....oh, but they're on the "road map!"