I love your shots. They are astonishing for lenses which can have more than 75 years... The 12th photo shows a bit flare. Probably there is a small leak when changing the lens.
Amazing photos with such a camera and lens which are really basic. Every time when I am shooting with one of your refurbished FSU cameras and lenses I think maybe selling my Leica M7 system and lenses. Even on 40x50cm enlargement with my Heiland Split Grade system and Rodagon lenses the difference with a J-12, J-8 and Elmarit, Summicron is so small.