All produce very good quality images.
From left to right:
1. Schneider Kreuznach Xenoplan 25mm f1.9 (very little vignetting on m4/3rds).
2. Cosmicar (Pentax) 12.5mm f1.4. Hard vignettes to a circle, needs machine beveling to fit mount.
3. Cosmicar (Pentax, older) 12.5 f1.4. Hard vignettes to a circle, but fits m4/3rd adapter(infinity)
4. Fujinon 25mm f1.4. Soft vignetting, v.good images, needs modifying to fit/achieve infinity focus.
5. Carl Zeiss Jena Tevidon 25mm f1.4. V. good images, colour. Needs modding to fit m4/3rd mounts.