Very nice purchase. I still have a very late model Prominent with the little lever under the winding knob. It is in pristine condition and even though I have not used it in years, I would never give it up. I have used both the Nokton and the Ultron on this way back when, and never noticed a huge difference, but considering all the reports of being one of the best lenses of the 50's, I have retained the Nokton and sold off the Ultron. It was a silver faced version which is not terribly common, or I have never seen many.
Again, I use the Nokton on my Contax IIA, interchangeably with the 50/1.5 Sonnar. Again I have the Amedeo adapter and a Prominent adapter which allow it's mounting on the Contax. I also have the much newer 50/1.5 Voigt
(Japanese) Nokton (again not the very latest version which looks like the LTM Nokton of the 50's) and have shot the Prominent Nokton, the 50/1.5 newer Nokton, and the 50/1.5 Sonnar on a Bessa R2. Amazing how these 50's lenses stand up to a super sharp modern lens which I think most agree is a super lens in itself.
For me who could be called an equipment whXXX, half the fun of shooting is trying all these combinations.
Raid, I applaud your choices and it has taken me all I can do to not have purchased a D700 in 2018. Ok there's still 2019!!!
Gary Hill