Well that camera laps up the quality through the glass! Very nice.
Did the 40mm f1.4 get a good review?
I noticed a trend in most of the Voigtlander lens reviews and feedback that I saw, this was from reading actual reviews as well as trawling the forums for any comments made from the masses. Most commentary related to, and was applicable equally to, the 35mm f/1.4, 40mm f/1.4 and to a very very small extent the 50mm f/1.1.
So if I were to summarise generally about Voigtlanders based on what I've read, it is that the lenses are 'character lenses', that is that they are generally known to have little quirks or qualities about them, including a slight lens barrel distortion and less sharpening at the corners or outer edges of the lens, and bokeh leaning slightly on the harsher side. Compare with Leica lenses where there is no distortion and sharpness is maintained throughout the photo.
There may also be some cyan in highlights or colour shifting towards the edges but apparently some Leica lenses suffer from that also (I know I've definitely seen it in the Panasonic-Leica lens on my LX5 for what it's worth), so I view this as a neutral point.
In spite of the issues above, there have been many people who have been happy with their Voigtlanders, either from not experiencing those issues described above, or from embracing those slight imperfections.
Probably my favourite summary I've read was Steve Huff's comment that (I paraphrase) for a fraction of the price of the equivalent Leica lens, with the Voigtlander you're getting about 90% of the quality of a Leica. Personally, I'm ecstatic with 90% of a Leica lens without having to pay 90% of Leica prices at this stage of my photography.
The only thing I didn't understand was backfocusing or focus-shifting (I've tried reading up on it but still don't quite understand what it is). While there were some sporadic complaints of back/shift focusing, many others have said they've never had a problem with it and I don't have reason to doubt the many fine photos posted on Flikr using Voigtlander lenses, so I don't perceive that to be a recurring or sticking problem.
The only Voigtlander lens which I saw far, far more positive feedback than negative was the 35mm f/1.2 which has been discontinued as far as I know.
So that in a nutshell is what I've understood from two weeks of intense internet trawling before I settled on the V 35mm which I am really happy with so far.