I've not had chance to test out the 'improvements' yet but will have a look to see if there's distortion on the 12mp. Did have charging go wacky after the update and it chirping every 1% as if cable was being inserted. Cache clear sorted that though.
Mine is the S20 5G Unlocked / SIM Free handset. If your handset is tied to a network then there can sometimes be a short delay in the release of updates due to network specific tweaks and load balancing when released. Hopefully it should land soon