But I wanted a 5cm 2.0 Leica thread to make a set, and finally found one on e-bay that looked new at a reasonable price, found this in Texas. These lenses tend to be scratched as the coatings are soft and most have had repair of dubious quality.
Great news upon arrival, it is perfectly clean, no dust inside, no sign of it ever have been opened for repairs, very slight cleaning marks, but can only see them with strong flashlight. Smooth focus and perfect aperture blades. Not sure what the infinity lock is for.
Lens is not in the same league as the 10.5cm, sides are very soft at 2.0 but the center is sharp. Very usable, best closed to 2.8 and further. I like it for casual photography, will compare to the 5cm 2.0 S reflex.