I have no idea how you use your camera, but everyone I have seen in professional reviews and user feedback going from an Fuji to an A7RIII/A7III have seen a huge improvement in battery life. The Z battery is known for being a performer and this runs true in my real life usage in the same photographical situations I used my X-T2 in. It is almost double the capacity but my A7R3 seems to only sip from it. Lasts ages.I guess it depends on how you use the camera, I use both in the same way and get very similar battery performance. Perhaps the A9 edges it but it's not a massive difference.
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