Below are crops from our laboratory Still Life target comparing the Pentax K-1 Mark II’s single-shot image quality to its predecessor’s, as well as to a number of full-frame cameras: the Canon EOS R (which can be considered a proxy for the 5D Mark IV DSLR as well), the Nikon D810, the Nikon D850 and the Sony A7R Mark III.

We’ve also included some comparisons of the K-1 II’s single-shot mode to the two Pixel Shift Resolution modes, as well as between the standard and new Dynamic PSR modes.
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https://www.imaging-resource.com/PRODS/pentax-k1-ii/pentax-k1-ii-image-quality.htm