I have a Rollei 35S with Sonnar 40 and Nikon with a Sonnar clone. They are good not even a 70 years old Leica. Keep Summicron if you are not a I bought a Leica , I did not like it and I had needed money person !
I did not understand why you invested such a money to these lenses without research and I did not understand why you wanted to sell after only few rolls. I think as I said it was GAS and now you need money as usual as Leica bashers experienced.