As Requested by Bros. I have made some quick shoot out test of my 50 and 58 primes
The constant setting are
ISO-100
WB-Auto
Setting was Standard color (+1 constrast and +sharpness My JPEG setting)
all photos are OOC JPEG just resized and added water marks using LR (resize to 1024x683)
Distance from the subject was not changed (using tripod)
to avoid shakes used tripod and timer
Peaking was used to focus
lighting is normal flouresent lighting with some natural light coming from the door/window
The contenders
From Left to Right <<Jupiter-3 50mm f1.5, Zenitar M2s 50mm f2, Minolta AF 50 f1.4, Carl Zeiss Jena Biotar 58mm f2, Leica-R Summicron 50 f2, Helios 44M 58 f2 (1st Version) >>