DxO represents the standard for camera and lens testing.
Unfortunately, they do not represent the standard for sensor testing (as opposed to camera and lens). They do not report read noise, gain, full well capacity, or other well established sensor characteristics. These values could theoretically be recovered from their SNR curve data, but that data is thoroughly overcooked. Too bad, because they to seem to have good protocols.
Regards, Bill P.S. - Inquiries to DxOMark regarding these issues go unanswered.