This photo illustrates well what people mean when they say that the 35mm f/1.4 AIS has a dreamy quality, unusual bokeh and shallow depth of field when used at maximum aperture, as compared with its rather different qualities of high sharpness and fine detail when used between f/2.8 and f/5.6 or so. I like the photo -- thanks for posting it.
I gather that you have a fair amount of experience working on lenses, as indicated by your willingness to tackle and successful completion of a CPU modification to this complex lens. I haven't tried anything like that. I have a Df, so I can use the 35 f/1.4 AIS via the "non-CPU lens" menu options. While that means the lens can only be used with manual or aperture-priority settings, it's not difficult to use that way. It says a fair amount about the quality of this lens that it is still delivering good images on DSLRs 35 years after the AIS version was introduced in 1981.