Scharf and in black sensitive to fingerprints, therefore recommended in silver

The lens I used in my Sony NEX-7 and NEX-5N and indeed mostly on the tripod.
And I have very often focused and determined manually that the sharpness of the images really at f5.6 to f7.1
is very good. But have the fingerprints on the black body and in particular the focus ring
prompted me to buy the version in silver. And here, as you can see - you can see (almost) nothing.

The image quality whether in black or in silver really is visibly better than the Sony SEL50F18 OSS.
The test result on the website photozone.de I can confirm at least subjectively.
On my Sony NEX-7 with the somewhat sensitive 24 MP sensor, the difference between the two lenses can be seen.
The Sigma is more consistently sharp; Sony is weakening
at the edge. Since the resolution is higher, I can see more details as to the Sony.

Unfortunately, Sigma has no image stabilizer and the light intensity is slightly weaker with f2.8.
The clacking inside the tube, I find not exactly inspire confidence, but is in accordance with
Manual represent not a malfunction. Reassuringly I find again the 3-year warranty,
which does not offer Sony (no extra charge).

Consequently, I can recommend to anyone owner of a Sony NEX-7 this glass from Sigma. When using a NEX-5N
is a change from 50mm f1.8 60mm f2.8 for OSS is not absolutely necessary. Here the focus is not profit
so much - at least according to my test images.