"The system which is free from Zeiss is the Hasselblad H system."
Joseph, this is incorrect.
I use all of my Zeiss 500 series lens on my H camera with a Hasselbad made CF adapter that is quite ingeniously designed and very well built. Unlike other adapters it is fully functional, and the Zeiss lenses operate exactly the way they do on a 500 series camera including use of the leaf shutters and no need for stop down metering ... the exception being that you don't wind the camera (the H is auto wind ), but instead cock the mechanical CF, CFE or CFI lens using a well placed cocking lever on the adapter.
I also use all the HC prime lenses from 35mm through and including 300/4.5. ... many of which are stellar performers. While some are not quite up to some Zeiss offerings such as the 100/3.5 and 180/4, this is mitigated by the use of Flexcolor's virtual APO software corrections when processing, making some of the lenses (especially wide angles) as good as or better than their Zeiss counterparts in some critical areas of lens performance when using Imacon digital backs.
Hasselblad was involved in the design of the H system including the lenses.
"Some of the lenses in the Contax system are well known to be better "
... which really means one lens: the 120/4 macro you cited. The remainder of the Contax 645 lens line-up, while pretty good, were in practice different due to being for a focal plane system thus offering faster apertures, but offering very limited flash sync speeds that many pros need ... which is why the H system with it's 1/800th sync speed is so useful.
The Contax 350/4 APO was a great lens but no Zeiss 350/5.6SA nor anywhere near the TPP FE 300/2.8. The Contax 35/3.5 is also good, but exhibits more distortion than the Zeiss 40/4 CFE IF, and certainly more than the Zeiss 38.
Don't get me wrong here, the differences in some cases are like splitting hairs. But one fact remains, the Contax 645 is a dead end system with no future, and the H system is alive and evolving ... and Hasselblad has done what it can to avoid abandoning it's previous customers of the V system with innovations like the CF adapter, and the more affordable CFV Imacon back that can be used on both the 500 and 200 series cameras.