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Comparison of photos made with Exmor R (Xperia S) and Exmor RS (Xperia Z) - photos taken at the same time, mode set to Auto.
It might be obvious, but which is RS and S?
Upper is R, lower is RS. I'm very disappointed...
Just did a few testshots with my ZR and the conclusion is that auto-mode tends to amplify any light in the scene, thereby exposing the noise from the sensor. Using SCN and choose nightshot gives a more realistic picture with less noise, and less light.
So I think that you're not really testing RS vs. R, but rather the Experia S vs. Z camera software. The noisy picture might be better for quick shots in a bar, than the darker picture from nightshot mode. But it would be a better result, if Sony would use a higher level of noisereduction.
I must admit that my results wasn't as good as those seen on:
http://knowyourxperia.wordpress.com/tag/exmor-rs/
But I probably was in a darker scene.