You cannot base everything off of the SnR ratios you see on DXOMark. Remember, the way each manufacturer handles the noise differs as well. Yes, believe it or not, there's more out there than just DXOMark SnR numbers. I know it's a shock that people actually can take pictures rather than relying on one website's circuit-level numbers. You can see actual comparison images on sites like DPR:
http://www.dpreview.com/reviews/sonyslta55/page16.asp
Also, consider that different manufacturers treat noise differently, and different RAW converters treat cameras differently and process images differently.
The older-generation sony sensor in the D5000 (based on the A500 sensor) is noisier than the newer-generation CMOS in the A55.
FYI, your link compared the A33. If you compared the A55, it's a different story.
I never put down cameras without justification. If you think that, you don't know me, or are just a nikon fanboi.
Your initial post said the ISO noise of A33 was better than the D5000. That was what I objected to. Don't know about the A55.
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