I've heard that the Zeiss cine lenses (Compact Primes, Ultra Primes, etc...) are just rehoused ZE/ZF.2 lenses. Are there any differences in the glass between their lenses of same focal length (i.e. Zeiss Planar T* 50mm f/1.4 vs CP.2 50mm T2.1 vs UP 50mm T1.9)?
Other then a few tweaks, cine lenses generally have more aperture diaphragms to obtain smooth round bokeh.
Here are cine version's capabilities: (35mm cine lens)
Here are photo lens traits:(35mm photo lens)
As for the glass they are mostly the same except some cotings and light traps
The cine lenses are different optically in that they are designed to minimise focus breathing, that is small changes in focal length when focussing, however they are very closely related to still photography designs.