Snegron
It is very interesting question you made. I am looking a long time to figure out photo-value for that ZF lenses (especially macro 50 and standard 1.4/50), but no any luck.
A lot of testings around. They are done with dig-cameras that does not utilize the lens made for film (say corners,…). Other look just to sharpness, but as I know all lenses on the market are sharp if they are made to be “sharp”. Than even and magazines do the same, not useful tests. Shortly all testings are based on beginners defending investment in the lens. No one need test to figure out that Zeiss knows how to make “sharp” lens. Even and Zeiss claim only resolution, what is not interesting to me.
No where I could see test how the lenses handle, e.g., out of focus area, compared to Leica lenses. If this is the same as for Nikkors, I just would still buy Nikkor lens while they are still available (manual lenses).
My the biggest concern is that new designed lenses cannot be made with Pb. To accomodate for this, new lenses are made with asperical element(s). However I never saw good aspherical lens, except from Leica (even and Schneider fail compared to old lenses). This particularly relate to out of focus area which appears as, more or less, as a double line which is distracting and signaling me avoid to use it.
You can go to my site PORTRAIT and on the first page see a little girl in the Church floor. It is just stuning portrait largerly thanks to Leica lens which has very nice rendering out of focus area. That background is I am after. That backgrond is something no painter EVER can make, or also just ANY digital system, it is one point that make photography unique medium. So again it is I would like to see on ZF lenses.
Might be the best solution at this very moment is to order one from B&H and test it. If it is the same as Nikkor just return it and get money back. I just do not see other solution.
www.Leica-R.com