I am questioning the wisdom and reasoning behind buying a 28mm lens when I already own a 35mm lens.
I am a literary critic. I do this for a living... and your note has so many layers to it that I can't help. Here, your first lines are something: you're questioning the wisdom of those who, having a 35mm, buy a 28... yet you feel inclined to do the same. Are you wise?
🙂 Are we who have bought both lenses wise? Hmmm...
I'd say we're plenty wise!
Specifically, I own a 35mm Summicron and am looking at buying a used CV 28mm 1.9 Ultron lens for about $350 from my local camera shop.
You have stated that you own a 'cron 35... and that doesn't stop you from fantasizing about a 28. Given the price and shape, I'd think about it. There may be other lenses in better condition and for a similar price. However, I don't see any fault in having both focal lengths. They're similar enough to become kind of interchangeable, and then distinct enough to have their own use. But back to your issue...
I'd appreciate hearing from others on why or why not they decided to buy a 28mm lens when they already had a 35mm lens.
If you really will appreciate hearing from my experience, here it is: when I have traveled to Europe, I like having a lens for street shooting, and another for city scapes. The 35mm provides the former, while the 28 gives me the latter. Besides, the fact that neither requires an external VF adds to the fascination. Because that's what it was to me: a fascination with the wide end of the focal length spectrum. My next Leica lens will be a 21mm... preferably something I can use with my metered and unmetered bodies.
Needless to say, I enjoy having both lenses and even take them with at once: my 'lux is a color shooter, while my Elmarit 28 goes for B&W.
That's just the way I like it, not based in any arcane knowledge or technique. Have fun shopping... but check other stores and other prices before commiting to the lens you described.
🙂