SteveHuffPhoto.com Its sharp wide open and stopped down. Build quality is very good. Vignettes on the M9 unless you manually set the camera to a 35 Summilux Pre Asph. Some copies of this lens may exhibit backfocus. There is obvious barrel distortion.
This Voigtländer 35mm f/1.4 is a poor lens lens if you worry about technical performance. It's unsharp by LEICA standards and loaded with barrel distortion.
It handles very well and is small and light. If you stop it down to f/5.6 or smaller and/or don't need the best sharpness or worry about distortion, you can make lifetime of great images with it.