A few weeks ago I snow shoe'd through the Serena Gundy Park and took both the Sony NEX 5n with the Sigma 19mm f2.8 and the Leica CL with the Voigtlander 21mm f4. I decided to bring along my Leica M to NEX adapter and do a quick test on the to see if I could see any difference between the two lenses. I reasoned that I should use f5.6 on both lenses, as it was not the maximum aperture for both lenses, where performance would be weakest.
Just off centre, where I took these crops, the performance of both lenses at f5.6 is outstanding, easily out resolving the 16MP Sony sensor. No difference, from what I can see. A quick check of the outer areas of the photo also revealed no discernible difference.
Which leaves me with one conclusion, for $100, the Sigma 19mm f2.8 is a damn fine lens.
|CROP - Sigma 19mm f2.8|
|Sigma 19mm f2.8|
|CROP - Voigtlander 21mm f4|
|Voigtlander 21mm f4|