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Very interesting. The D750 does have quite a reputation and so does the D810.
The star eating hot pixel algorithim of Nikons was rewritten by Marriane Oleud and she has stated on DPreview forums that it no longer eats stars. That was a while ago.
The Sony a7R is probably a match for the Nikon in many ways. Sony also applies a hot pixel suppression to RAWs in bulb mode but the image is 12bit not 14 bit. So the Nikon may be a bit better. But I think 2 images one from each would be hard to tell apart.
The main advantage of the Sony is the evf, the lighter weight (Nikon and Canon DSLRs with a big lens are overweight with a Polarie).
The EVF enables easy nighttime focus and its also WYSIWYG so you can see what ISO you need to dial in. For the same ISO the Sony is brighter than the Nikon so Nikon must overstate their ISO a tad.
The new a7Rii at the moment seems to be having coloured noise speckles in long exposures which seem to be corrected when using Capture 1 for conversion. Not sure if it will be handled with a firmware update as the other Sony a7 models do not do this so a bit of an oversight there.
Greg.
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