Yes, it is appealing as I have both Canon and Sony gear. If only it had AF... without AF the usefulness is greatly reduced, for me at least.
However, I can see people owning both NEX and Zeiss ZE / Canon's TS-E and MP-E lenses wanting to get this adapter.
However, I can see people owning both NEX and Zeiss ZE / Canon's TS-E and MP-E lenses wanting to get this adapter.