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Dj Joofa
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Can anyone else define in technical terms? I'm sure even if the files are around the same size it's not that black and white.
Of course there are technical measures of comparison. One is "perceptual image quality assessment." However, the problem with this method, and similar methods, is that it will require a reference image, and how do you obtain a "reference image" for the scene your camera is viewing? Well, there are some solutions available for that, but I can't go into their detail, suffice to say they are in the "secret sauce" of companies.
If one can't obtain a reference image, then there are other methods that do not use a reference image. One such method is called "blind image quality assessment." It is based on some other notions of what constitutes a good image as far human vision is concerned, because as a human one does not need a reference image to say the quality of some image is good/bad.