With all this talk of a possible 50mp camera I am starting to think how I would utilize a camera like that for my work (mostly weddings). I would definitely not mind having access to 50mp for portraits, but for other aspects of the wedding day, like shots at the reception, it would probably be my preference to switch to mRAW which with a 50mp sensor would be what? Around 20mp? However, I have never used those formats and am wondering how much, if any, IQ you loose from compressing the image in camera like that?
I worked extensively with the Canon CR2 format, the m/sRAW all have white balance pre-baked into the data, and de-mosaic processed so they are in theory not really "RAW".
Where real RAW format has the raw bayer data like RGRGRGRG, GBGBGBGB in each row;
m/sRAW has data demosaic processed and WB applied, then converted to Y-Cb-Cr format, and -
mRAW stores as YCC 4:2:2 format, and sRAW stores as YCC 4:2:0 format
If you ever worked with video codec you will see that they are not really "RAW" format anymore, so tonal range and DR will suffer, and the file will not be as mallable as the real RAW data.
Hope this helps.