Have tried Leica Summarit 50/1.5 (1952) on my a7rII, and fell in love (with this lens).
Fairytale by Ilya Artemiev, on Flickr
V oh V by Ilya Artemiev, on Flickr
V by Ilya Artemiev, on Flickr
Leica Summarit 50/1.5 was one of the favorite lens of H.Cartier-Bresson