For anybody who is using pixel shift frequently and wants higher res images, the Panasonic s1r is hands down the way to go. It’s a full frame, mirrorless, 47megapixel pro level camera.
It has a high res mode that takes 8 shots and blends them in camera to output a 187megapixel raw file that is 55″ on the long side at full rez. You can easily upsize that file to 90″ or more with detail intact. It’s an underrated and excellent camera.