These links/site may be relevant to this discussion. The first is on the effect of Pixel Shift mode for the S1R (but there are others) and the second is the general homepage with lots of charts and in-depth explanations of the analysis elsewhere on the site… a lot of which is more engineering and science than photography.
- Photographic Dynamic Range versus ISO Setting - Panasonic High Resolution Mode Special Edition
- Photons to Photos
Relevant info in screenshots below but you can make your own with many camera models - there is a A7Riii Pixel Shift specific page as well but nothing newer.
- Below: Note the Pixel Shift (HRM in the image) peaks much higher than the regular capture compared to nearly all cameras and compares favorably to a top of the line Phase One. Unless each brand does it entirely differently, this is likely to hold true for them as well and is shown on the Sony, Olympus, etc pages.
Clearly I have become deeply interested in this despite not having the engineering background to fully understand the “why”.