Hi Samuli
I also struggled between the C/Y and the ZE versions and finally went for the ZE version. I told my self that the ZE is a newer piece of hardware made by the same guys who made the C/Y version, and so it should be a more solid performer. Lack of guarantee, marks of wear and a very close price tag made the rest.
The ZE version might outperforms the C/Y version, even someone here posted MTF charts showing that the ZE is a better performer. HOWEVER, I also have the feeling that the C/Y version achieves that 3D look more easily than the ZE. That is really nagging me. I have eventually offered my CR2 files to the fore, expecting to find some RAW files from the C/Y in exchange, but in vain.
That green bush above shows that the ZE can do the job, but I haven\'t succeeded myself yet, and I am still wondering if the C/Y might make my life easier.