See my Pentax K1 wish list at B&H Photo.
Shot at night in part to explore performance of the Pentax 15-30mm f/2.8 ED SDM WR.
But the area of interest here is sensor quality of the Pentax K1 for night exposures, and in general, with SuperRes pixel shift mode.
The examples show that the Pentax K1 is medium format quality, indeed superior to medium format in that it offers extreme sharpness free of moiré and aliasing effects (in SuperRes mode). The flip side is that checkerboarding artifacts are provoked by changes in lighting along (not just motion), so it is a dual-edged sword.
Shot in SuperRes mode for all frames. Presented at sizes up to 28 megapixels with large crops and the ACR conversion settings.
Your jaw should drop in viewing the crops—no conventional DSLR or mirrorless camera can deliver this kind of image quality (extreme detail that is moiré and aliasing).