Here is the high ISO comparison of Nikon D810, Canon EOS 5D Mark III, Nikon D610 and Sony A7R.
All images are RAW files:
Read More at dpreview
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Can we please stop doing these 1:1 pixel comparisons?
Signal to noise ratio, please.
Or max ISO for a given amount of noise.
Or amount of noise for a given ISO.
If sensor size is the same, the SNR is given by the amount of noise.
Noise changes with amplification and amplification algorithms change from camera to camera.
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I think this is less scientific and more subjective. I look at the images, pick the photos I like and match them to the camera that took them.