I always suggest the same thing. Go test one yourself. A LOT of factors influence DR, color, and noise. dXo does a good job of measuring some of them, sensor testing/spec-sheets measure some of them, but nothing measures all of them other than real world shooting...
Lens Hood / Flare > Lens coating > lens > aperture/shutter > body's internal blackness > IR filter > microlenses > AA filter (or lack thereof) > sensor size > sensor pixel type > readout speed > sensor-to-AD-convertor path, A/D convertor (both bit depth and quality) > heat sinking / cooling > raw file compression > black calibration > in camera raw data manipulation > characteristic curve > ICC profile > demosaic algorithm > deconvolution algorithm > noise reduction type > up-res or down-res algorithm > sharpening
Testing a camera/back in real world shooting takes all this into account and shows you what matters: what the picture looks like and how it can be used. Talking about dithering bits is kind of fun, but serves very little real world purpose. The components of high-end backs are selected to create the best possible image and that includes far more than the evaluation of the number of bits of the convertor.
Also remember that the type of noise is in many ways far more important than the absolute mathematical quantity of it. I'll take a fine gaussian filmlike grain over a chunky inorganic digital looking blobbular mess any day of the week regardless of how they compare to each other mathematically.
Doug Peterson
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