I want to choose a camera with the best signal-to-noise ratio within my budget. I want to ignore producer's marketing BS and reviewer's presumptions that "something's really cool". I know about DPReview Studio shot comparison but here I have to rely on my eyes and it doesn't contain all camera models.
Camera manufacturers and independent sites offer sets of full resolution camera sample images. I can find similar (not identical) scene types, taken with the same ISO setting, the same physical focal length and possibly with the same aperture.
Is there a reliable method to compare e.g. 5 pairs of photographs to find out which camera offers better signal-to-noise ratio? Is there something better than my eyes?