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From what I see, I am in mp's camp - the pre-asph 90/2 is most likely a good start. The Leica-Rs are pretty different among themselves even, and I add to the mix the amazing 100/2.8 APO, a lens so good at what it does everyone should be able to afford one. Alas it's not so.
Of the CZ offerings, apart from the faster short telephotos, the 85/2.8 and 100/3.5 in the Contax range are sweet and small and have a very Sonnar signature, and soft bokeh. The faster 100/2 CY you see some lovely images from, it was a big favourite. Note that there is not one Sonnar in the ZE/F range - until the 135/2 arrives. Zeiss do seem intent on a Sonnar revival right now, the RX1 and I think maybe the NEX 24/1.8 also, good for them.
The 100MP is intended more as a general lens than a macro, that is how most use it.