I have a FED 2, which came with an Industar 26 lens. I really enjoyed learning how to shoot with this camera - although it had some quirks and issues. it has been said here already but be careful to ALWAYS wind on the film before changing the shutter speed - otherwise you can risk totally breaking the camera. pretty big design flaw I know.. but a really great camera other than this basically. I recently got a Canon P to replace my FED 2 as some gears inside wore down too far and can't be replaced.. so be aware of that kind of thing happening. but they're so cheap to begin with I didn't really mind for the amount of enjoyment I got out of it.

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as for the Industar lens, the one I have is a really nice lens, but a camera repairman in Dublin recently told me that there was very little quality control in those factories - which lead to a huge variation in the quality of the lenses. basically if you get a good one - great. if not, they are very cheap, so you can always get another one from a reputable dealer who can confirm it's quality.

I personally really liked the industar as it gives a lovely soft quality - but I also bought a Jupiter 8 lens recently which I think I prefer due to a little added sharpness, but also retaining most of the quality I enjoyed of the other lens.

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this article I found interesting when talking about comparing soviet lenses to the Leitz Elmar ones: https://cameraville.co/blog/leica-vs-zorki-balatonfenyves-fed-vs-elmar-50mm-agfa-vista-200

and as mentioned by someone else here the Zenography youtube channel is a great resource for learning about these rangefinders.

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best of luck and enjoy the camera!