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I have the Nikon D810A and a modified Sony A7S. I'd be curious to hear what the issues are with the D800 flats and see if the D810A has the same issue or not.
As for the D810A having the same sensor as the A7R, the one thing to note about the Sony Alphas are their star eater issue. I have this on my A7S too however am not affected due to shooting at 2500mm focal lengths however is readily apparent in shorter 300-800mm focal lengths.
The D810A does not suffer from the star eater issue despite the same A7R sensor. That star eater issue is specific to Sony's algorithm (post data dump from the sensor).
There are some nice extras in the D810A firmware not available in other non-Astro dedicated Nikon models. These little extras help in focusing/framing, etc.
My only gripe (but rather unfair expectations on my part) is compared to my modified A7S, is my A7S is cooled. I don't think I'd use more than 5 min (during winter, less during summer) subs due to sensor heat noise.
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