DXO mark just published the Sony A7 R III test results and surprisingly the score of Sony 7R III camera is exactly same of Nikon D850. All test scores of the camera exactly same but due to the mirrorless properties Sony A7R III, the A7R 3 camera is able to perform better during low light environment and hence the score of Sony A7 R3 in low light ISO score is better.
Take a look at the DXO Mark Lab Conclusion
Comparing the A7R III sensor to the Nikon D850’s reveals the advantage that the Nikon camera’s lower minimum sensitivity (ISO) value brings. Photographers who predominantly shoot in bright light or capture motionless subjects with the camera on a tripod will record the most information, be it color, tone, or detail with the Nikon D850 set to ISO32. However, if they require values above that, the Sony A7R III sensor produces marginally better images.
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