Nikon D850 vs Nikon D810 comparison article is ready and you can check the details of these high-end DSLR cameras with full-frame image sensors.

The D850 uses a Nikon-designed back-side illuminated (BSI) full-frame image sensor with no optical low-pass filter. Effective pixel count of the FX-format sensor is 45.7 megapixels.

The Nikon D850 also offers the D5’s excellent 153-point AF system, as well as a native ISO range of 64-25,600 (expandable to 32 or up to 102,400). The DSLR also improves on the D810’s video offerings with the inclusion of full-frame 4K 24/25/30p capture.

The Nikon D850 looks to be an excellent upgrade over its predecessor, the D810. The sensor resolution has been upgraded from 36.3MP to 45.7MP. Tthe burst rate has jumped from 5 to 7 fps (9 fps combining the new MB-D18 grip with an EN-EL18b battery), and the entire AF system borrowed directly from the flagship D5.
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https://www.dailycameranews.com/2017/08/nikon-d850-vs-nikon-d810/