There is only a 22% difference in resolving power between a 33MP and 22MP back. Print size is limited in either back.
Print
area is 50% more though
.
The DoF is the same between the two backs. DoF is dependent on format size.
DOF is a funny topic. It's perfectly possible to be completely correct but still be misleading for new comers.
Many definitions of DOF date from the days of film when a given print size and viewing distance was the normal method of evaluating whether everything in the image was equally sharp.
The new norm is evaluating at 100% on screen to evaluate whether everything is equally sharp. In this method of evaluation the result depends greatly on the resolution of the back. One need only look at a full resolution 80mp raw, and a 1000px web-jpg to see a demonstration of this. They are the same scene with the same lens and same aperture but it's perfectly possible to see everything in the lower-res file as being equally sharp but to notice areas that are distinctly less sharp than others in the full res file.
Whether you technically call this "DOF" or "range of equal apparent sharpness" or "whatever" is not terribly important to me. Regardless of what you call it, it affects the buying process of prospective buyers and influences the photographic decisions of the owners of the equipment.
Of course you know this, I'm just clarifying for those who might confuse semantical correctness for practical advice.
Put differently and avoiding any semantically-touchy terms:
"When using a 33mp back instead of a 22mp back a given aperture will show a smaller distance range of the scene as equally sharp as viewed at 100%." The difference in this regard between 22mp and 33mp is not huge, but it is there. Our customers notice it most when jumping to the highest resolution models (e.g. Credo 80 or IQ180).
Or: "with great (quantities of) pixels comes great responsibility"
Or even more succinctly: "
mo pixels mo problems" Not that this has ever stopped me from pursuing more pixels (or more money :ROTFL
.
After all if it was
easy to make a 48" print with super sharp detail then everyone could do it, and then where would be the fun in that?