Yes Jim, there is one major problem with Zeiss lenses PRICE!
If you can afford a Zeiss lens you have one of the finest lenses money can buy. I think dubaiphil will vouch for that.
Manfred I doubt that Carl Zeiss will have their name on any product that does not comply with their own standards. No matter if it is made by Zeiss or not – it should be very good. Sony cameras in general have very good glass.
With a Panasonic P&S the quality of the Leitz licensed lens shows.
No matter what, that Sony 55-300 will be a lot beter than any Tokina, Sigma or Tamron lens. And yes Jim, it should be worth every cent you paid for it.