OK, I'll bite on that one. Assume, for the moment, equal detail in your JPEG and your raw (and for that matter your BMP and your PNG and your TIFF) versions of the image. So far as detail goes, you cannot get a better upres from any of those formats than you get from any of the other formats - the information that is contained in the image is the information that is contained in the image. End of story.
The real question, then, is do the different image versions contain equal detail or not?
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