The new Zeiss is tempting, but I'm gonna stick with my adapted Ultron 28/2. It makes a great pair with the 16mm kit lens (42-24 equiv), and the speed difference and manual focusing don't bother me. 28mm is the "normal" for APS-C anyways.
Zeiss Ikon, Nokton 35/1.2 v1, Nokton 50/1.5
Neopan 400, Acros 100, 160S