Originally I got the Carl Zeiss Biogon T* 2/35 ZM due to it's rendering style; extreme high contrast and micro-contrast on focus plane, transitions from focus plane to boke, focus plane vs boke contrast difference etc. are all very close to what I consider optimal compromise on a lens. This lens produces quite ugly boke wide open, like most lenses I like but f/2.8-5.6 results are very enjoyable to my eye.
This lens was pretty hard to get working with Sony. It's not at all usable with standard thick filter camera. It works for easy stuff like closed down landscapes on Kolari v1-3, but outward field curvature ruins all boke shots (example of horrible corners jumping into focus). Finally combining Kolari v2 camera to "Front-end filter"-method I was able to get the lens to work. I'm still in middle of testing and now I'm using 3000mm Plano-Convex lens, but I need to try 2500mm and 4000mm as well before confirming 3000mm is optimal with Kolari v2 sensor stack.
f/2.8
f/2.8
f/4
Samuli
Mar 22, 2017 at 05:02 PM
Previous versions of Samuli Vahonen's message #13971607 « Sony FE Images Thread »
but f/2.8-5.6 results are very enjoyable to my eye. 
