I had both the Zeiss 12mm and 32mm lenses. After buying the Fuji 35mm and Fuji 10-24mm lenses, I sold both of the Zeiss lenses. I used Zeiss primes on my Canon FF DSLRs, but was disappointed that the Fuji versions didn't have the sharpness or micro contrast of the Canon versions.
I recently purchased the Fuji 35mm f2. It's an excellent lens and focuses faster than the older 35mm f1.4. Both are excellent image makers. If I could only buy one, I would buy the f2 version for the weather sealing and smaller size and weight. It costs less too!
Regards,
Bud James
www.budjames.photography