Zeiss Contax prewar Collapsible Tessar ?

I want to add that recently I discovered that the 5cm f/2.8 Carl Zeiss Jena Tessar (silver version) exhibits significant (read: more than the Sonnar) focus shift all the way up to f/8. The good area of focus moves backwards quite significantly. This behavior was confirmed with a second (black) copy by Goliathus. (I don't know if he still posts here.)

I like the look of a Tessar lens, but practically I think the Tessar 3.5 is the better choice, a less stretched design. Or, just go for the masterpiece as Brian (IMO) correctly suggested.
The price difference today makes the Contax Tessars (exempting the brilliant Opton rigid Tessar) almost not worth it.
 
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