the creammachine 135/f2.8 STF vs the Zeiss 135/f1.8

As others have said, they are two very different lenses.  I'd only get the STF if you are going to take a lot of the types of pictures it is good at. I use my 135 1.8 for shooting pictures of my wife and daughter.  So, the Zeiss was the only answer for me.

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yakkosmurf
http://www.flickr.com/photos/yakkosmurf/
a850, a700, R1
24-70CZ, 16-35 CZ, 135CZ, 70-400G, 70-300G, 16-80CZ, Sig 24 1.8 & 10-20 4.5
F58AM flash