I've always had reservations to the older, retro fixed focal-lenzed rangefinders. Their lenses seem to cloud up, deteriorate with time in ways interchangeable lenses won't and I think it's simply the lack of movement, being stuck or fixed in the same place over time doesn't allow for "good breathing" or even simple cleaning.
Anyhow, speaking of Minolta, and If you've got $$ to spend, Minolta CLE & it's companion Rokkor rangefinder lenses are enticing....
I've had a number of these older fixed-lens rangefinders - I used a Konica S2 and then a Canonet QL17 a lot starting in the late 80s, 90s to the early 00s. I still have both of those original ones, and a number of others acquired as people cast them off. Most of mine still work, but there are a few with stuck shutters or whatever. The main issue that I see is that many of the light meters have become unreliable; whether this is due to deterioration/oxidation of the circuit (few of mine show corrosion) or of the cell itself is unknown. For this reason, I prefer the ones with a manual mode to the auto only ones (I make an exception for the Olympus XA series).
Anyway, I don't think they suffer more from hazy lenses, that's less of a problem for me than sticky shutters. But if they do, the problem is most likely not the fixed lens (after all it gets aired out when you open the back), but the fact that they have a between-lens shutter and an auto-stop-down iris. These are more complex than a Leica-style rf lens with no shutter and a manual iris, and a possible source of lubricant in the lens. The other "problem" of course is that people are more likely to pay for a cleaning on a Leica lens than a Canonet.
With most of these cameras, you are talking about a 40-60 year old camera, so today's condition is important. I could make stuff up about reliability of this model or that, but the question is does it work and is the lens clear today? If so, it will probably still work and be clear next week. But if it's bought untested, there is no guarantee it will be usable.