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Interesting. I would invest in good lens if I were you. You already own a mirrorless (I don’t know it’s low light performance though), what is your reason for moving to Sony? I assume you might already have a couple of nikon mirrorless lenses too.
I had always owned Nikon (crop sensors) but recently moved to Sony primarily because of low light performance and fast autofocus (which is critical for wildlife).
Want to know your reason for thinking of a change