Armando, I spent less than 5 minutes researching lenses and saw some of your posts over on the rangefinder forums. Man, when do you find any time to work with all the forums you hit?
The Skopar you mention is kind of near the top of what I'm looking to spend since I'm not even sure I'm going to become a convert.
So let's imagine for a moment that a good copy of one of the Voigtlanders can give a simpleton like myself 90% of the experience of using a 4 digit lens for 50% of the price. Are there lenses out there that get get me 80% of the performance for 25% of the price? Should I just stay away from the Russian lenses? Are there other options that you would consider?
IMO, most if not all of the Voigtlanders give close to Leica performance at just a fraction of the cost. Like a good Leica-phile buddy of mine named Ashwin told me, the price increases exponentially for the last 5-10% of extra performance that one "may" get from a red dot lens over other brands.
The Cosina Voigtlander lenses I own and use extensively are:
Nokton 50/1.5
Nokton 35/1.4
Skopar 50/2.5 (least used lens of the five, because of the duplication)
Skopar 21/4
Heliar 75/2.5
I can wholeheartedly recommend any of them as they are all good performers. The two Skopar and the Heliar were purchased used. If I recall correctly, they were all less than $400. All, but the Nokton 35/1.4, are also screwmount lenses. So a screwmount to M adapter is necessary. Stephen Gandy at Camera Quest sells them. For Leica cameras, there are different types of adapters that are necessary to trigger the appropriate frame lines in the viewfinder. But for the Bessa, you have to choose the frame lines manually. But I'd still buy the matching adapters just in case you get a Leica in the future.
I also own a Leica 90 Summicron pre-aspherical that I bought used for a good price, but I have barely used it just because it's big and heavy (relative to other M lenses). It wasn't until about a month or two ago that I finally splurged big time (relative to other M lenses again), and got a 50 Summilux aspherical, which was more or less my single life parting gift to myself! Being completely honest though, the Nokton 50/1.5's performance is right up there with the 50 Summilux. At worst, to my eyes anyway, the Nokton gives 90% performance of the Summilux' performance at about 15-20% of the price.
In between the Voigtlander and the Leica's, from the standpoint of price point, there are the Zeiss. Some would argue that the Zeiss are every bit the equal of the Leica, if not better. The detractors argue that the Zeiss are made by Cosina Voigtlander in Japan, and therefore, they surely can't be as good as a German made Leica. I personally chuckle when I hear comments like that. For the Zeiss, I've owned and used the following:
Biogon 21/2.8
Biogon 28/2.8
Biogon 35/2
C-Biogon 35/2.8
Planar 50/2
Again, I wouldn't hesitate to recommend any of them as well. But they are more expensive than the Voigtlanders. And I no longer own any of them, because after using them, I really felt that the Voigtlander lenses are definitely more than good enough for someone like me. The only exception would have been the Biogon 21/2.8, which I thought was clearly superior to the Skopar 21/4. But it was also 3.5X the price of the Skopar.
Here are some samples using various lenses. They are going to be mostly photos of the fiancé, as she's the most willing photo subject that I have! Most photos have probably been somewhere in this forum before. All have been tweaked in LR.
Nokton 50/1.5
View attachment 52867
Nokton 35/1.4
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Nokton 35/1.4 with Portra 160vc
Heliar 75/2.5
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Summilux-Asph 50
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Planar 50/2
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Skopar 50/2.5
Nokton 35/1.4
Skopar 21/4 (I cropped the edges on this one to get rid of the cyan edges that occur when used on the M9)
Hope this helps to give you a rough idea. There are more photos on my Flickr as well. Good luck in getting your first M lens! And totally look forward to seeing your film photos from the Bessa!