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The comparison is available here : http://www.dxomark.com/index.php/Cameras/Compare-Camera-Sensors/Compare-cameras-side-by-side/%28appareil1%29/895
The lowlight scores are very close from 792 to 926.
As this is a logarithmic scale, the difference is even closer than it looks like. In fact it represents a difference of less than 1/3 Stop.
The DxoMark team