Disclaimer: I am somewhat techno-averse. Extensive lens/film/camera testing is something I benefit from in a tangential way, but not something that I am allowed to do since my brain is fitted for something else. When I get ready to make an equipment purchase, I rely on a bunch of resources including the people here and in other forums, plus various well-known reviewers/testers. Then I spin around three times, sniff the cork of my 18 year old Balsamic Vinaigrette, and throw a dart at a Crazy Eddie full-page ad (a bit of an exaggeration, although i take every opportunity to enjoy the Balsamic.)

So in a feeble effort to contribute to the massive amount of statistics and test data that are so important, I offer this comparison of sensor quality as determined by DxO labs: http://news.cnet.com/8301-13580_3-10143368-39.html