Noise and JPEG quality

The RX100 has generally very good JPEG processing and noise reduction; it does a creditable job of balancing tradeoffs between color noise and softness. Out-of-focus areas still suffer from mushiness as low as ISO 400 -- a common problem with smaller-sensored cameras -- but in-focus spots stand up pretty well until about ISO 800. Overall, the camera's solid up to ISO 400 and acceptable through ISO 1600, depending upon scene content.