[Analyst]

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Canon also have some specialized lenses that I don't think Nikon can match. Like the 50 mm f/1.2, 85 mm f/1.2 (which I have) and 200 mm f/2. And tilt and shift lenses. Somebody correct me if Nikon have lenses that match these.
They're expensive though, so it doesn't matter too much to the average photographer.

I have a couple of friends that own Nikons and they're all happy with their cameras. You really can't go wrong with either brand.

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Nikon has f1.4 versions of the 50mm and 85mm lenses,and a manual focus 50mm f1.2. They also have a 200mm f2. The 50mm f1.4 is pretty reasonable, less than $300, but the others are pretty pricey, very much so for the 200mm (more than $4k).

And to second, or third (or fourth) it - either brand should work just fine.