Sigma 14mm f/1.8 DG HSM Art Aperture Series: View to High Peaks from Chickenfoot Lake, Sunset (Nikon D850)
This aperture series is an outstanding example of field curvature with a wide angle lens, and how much depth of field (stopping down) is needed and mild and how much stopping down is needed for this type of landscape image.
The higher pixel density of the 46-megapixel Nikon D850 makes it a more demanding camera than the 36-megapixel Nikon D810. Also, f/11 is slightly more degraded on a per pixel basis from diffraction, thus making choice of focus even more critical, so as to not have to stop down more than necessary for depth of field.
Includes images up to full camera resolution, from f/1.8 through f/11.
This series is also a good look at how the Nikon D850 performs.