The lens looks like the Takumar 135mm f3.5 and almost the same size as well. The copy I have is not Super Multi-Coated, just Super Takumar so it doesn't have the famous multi-coating. This may explain why the lens has very severe colour fringing, especially green, in backlit and sometimes not even contrasty scenes. It's trivial to correct in Lightroom, but still, it's bothersome. The lens does not have very high contrast, properly designed like that as it's a portraiture lens. It's also not very sharp until stopped down to around f5.6 to f8; again, this might be designed like this. The other thing I don't like about this lens is the relatively long minimum focus distance of 1.2m.
Too bad I am not using this lens as a portraiture lens like it was designed for. Still, it makes a nice short telephoto lens and is quite versatile. The small size and the lightweight are nice. It also inherits the legendary build quality of the Takumar lenses and focuses butterly smooth.
And, you may like it more than I do.
The girl & her dog - NEX-6 & Super Takumar 105mm f2.8. Click for larger.
Lone Leaf - NEX-6 & Super Takumar 105mm f2.8 with Yeenon Helicoid. Click for larger.
Park Bench - NEX-6 & Super Takumar 105mm f2.8. Click for larger.
Stairs - NEX-6 & Super Takumar 105mm f2.8