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This is just a quick comparison shooting some ornaments on my tree. First, this is using my Sigma 35mm F1.4 ART DG HSM on the Nikon Z6 using the FTZ Mount Adapter.
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With the Fuji, I am using the kit lens XF 18-55mm ƒ/2.8-4. It is close to the same format I shot compared to the 35mm.
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Here I am shooting with a telephoto range using the Nikon 85mm.
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Here I cropped into about 100%
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Overall I think the Nikon Z6 focused faster. I was using the point to focus. I did the same thing with the Fuji X-E3, but there is a little back and forth with the Fuji.
In my opinion, the larger sensor gave a cleaner file and less noise than the Nikon Z6.
I noticed that the Fuji kit lens compares nicely to the two sharpest lenses I own for the Nikons.
When it comes to travel I still would prefer to carry the smaller Fuji. I think I give up a little performance to pick it, but less weight.
When it comes to performance, I believe the Nikon wins.