Another winner by Voigtländer. I really am impressed by the quality of these lenses, now built by Cosina. You know you have a quality product when handling these lenses. They should last you a lifetime if you take care of them. All metal and quite heavy compared to other lenses you can purchase today, it really is fun photographing with these gems. I now have quite a few Voigtländer lenses and I haven't been disappointed by any of them so far. Of course, don't use these on the Nex-7, you're just making more work for yourselves due to the purple edges you get from that sensor. If you shoot in B&W then you won't have that problem but I prefer to shoot colour and convert in PP.
P.S. The vignetting you see does not come from the lens on the Nex-5N, I did that in PP.
P.S. The vignetting you see does not come from the lens on the Nex-5N, I did that in PP.