I don't have the "cine" version of them, but I do own the normal versions, which are the same minus geared focus and stepless aperture. They are awesome and I use them for shooting commercials and music videos. I very much prefer them to Canon L lenses and unless you shoot wide open only, there is little to no difference with Carl Zeiss.
That is, if you get good copies. I found on the internet very mixed reviews, I must have gotten good copies. I'm very picky with sharpness, CA, and every aspect of optical quality in a lens. All of their lenses are so-so wide open, but as soon as you stop down one stop you're good to go. Except the 24mm. I love it even wide open.