Filesize should be around four times a regular RAW file, and pixel number is exactly the same as in a regular shot. Increased detail is achieved by making Bayer interpolation unnecesary, not by increasing pixelcount.
In this regard Olympus' Hires goes one stop beyond: with 8 shots produces higher pixelcount, virtually eliminates all traces of colour/monochrome moiré, and achieves higher noise reduction. Too bad that Olympus didn't include a less ambitious but better understood 4 shots mode as this one.
Regards
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