The lens resolution chart (Source: Lenstip)
– The tested stabilization efficiency is about 3.5 EV (which is a good result says Lenstip).
– The resolution at medium aperture is almost as high as the best lens of the class, the Nokton 25mm f/0.95 (80 lines per mm vs 82 lines per mm)
– At f/1.2 aperture the center performance is said to be “brilliant” and on par with the Voigtlander 0.95/25 and the Olympus 1.8/75.
– At f/1.2 the corner performance is “positive”
– Chromatic Aberration is present at wide apertures while the lateral chromatic aberration and spherical aberration are well corrected.
– Negligible distortion
– The lens corrects the coma in a splendid way. The astigmatism is not a problem either.
– Bokeh is pleasing and at f/2.5 the bokeh effect is very similar
– at f/1.2 aperture the lens shows a very strong vignetting (-2.23 EV)
– it has a good resistance against ghosting and flares.
– Autofocus is fast and very accurate
Overall the only big negative is the high vignetting at f/1.2 aperture. That said I would have loved to see a comparison between the Nocticron and the 42,5mm Voigtlander to see who delivers the best image at f/1.2 aperture! Maybe some reviewer is reading this and will make a comparison for us :)