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Pentax SMC Takumar 50mm f1.2

Heavy chunk of glass, preliminary tests shows it has very good contrast even wide open, with a razor thin depth of field; contrary to the Nikkor one there seems to be (comparatively speaking, this is f1.2!) very little chromatic aberrations, even wide open.
All these shots were wide open

In town

Probably f4. Very little barrel distortion too

Wide open. Watch that DoF!

f5.6 or so