Upload & Sell: On
The way I look at it is as follows - a lot of folks consider the 135mmL as their entry to the "L-lens realm" because of the affordable price and its stellar reputation, both optically and mechanically (read: AF speed/accuracy). After a while they realize that it is not the easiest lens to use. Your focusing technique has to be accurate, at least when using wide open aperture, which the lens is fully capable of generating great images, and the lack of IS, resulting in blurred images due to camera/lens combo.
I would be bet almost anything that the Zeiss lens is an awesome optical marvel but the lack of AF (and the same lack of IS as the Canon lens "suffers" from), would turn off a lot people looking into a 135mm f/2.0 from considering the Zeiss. We are not even talking about the price difference here. Why would Zeiss introduce a lens in that very tight market segment with similar specs is beyond me. I know that they have a 135mm f/1.8 in Sony mount. The speed difference would make it more attractive. I had the Zeiss 100mm f/2.0 Makro and it was a wonderful lens. It doesn't have AF, (hybrid) IS and it doesn't go to 1:1 macro range but at least, it is faster than the Canon counterpart. That faster speed was what attracted me. Except for the Apo designation, the Zeiss doesn't seem to offer any advantage. Sorry, and I know a lot folks may not agree with me and that's fine. Please note that I would not say that it may suffer the possibility of DOA, that would be too harsh but.... . Oh, well.