[Klaus]

Yes, Zeiss is surely not happy with Sony at the moment. It seems as if their partnership has ceased to exist - other than having a mount license.
There were no new Sony-Zeiss co-designs lately.

To be fair here - the Sony-Zeiss lenses often lacked greatness - albeit it is unclear what that relationship was all about. Just a design verification by Zeiss or Zeiss-native designs?
We won't find out.