I had a copy of this lens and sold it. My copy wasn't very sarp wide open, and had quite low contrast. I didn't have flare problems because I always used a hood. I don't remember this lens had any specific "character" that distinguished it among other lenses, neither a "high end" character that Leica and Zeiss lenses have, nor "low phi" that old character that Russian lenses have.
My copy was black paint which was really thin and wore off easily after moderate use.
Another thing about this lens is that it's an LTM lens, it needs an adapter and the minimal focus distance is 90cm and not 70cm as in M lenses (if that's an issue for you).
I guess you understand by now that based on my personal experience, I don't recommend this lens. There are many alternatives - Nokton 35/1.4 or Zeiss Biogon 35/2 (650USD used) if you have more cash. You can get a Leica Summicron 40/2, if you don't care for the 5mm's, for about 400 USD. Or cheaper lenses such as Skopar 35/2.5 or even a cheap Jupiter 12. To me, all of them are a better deal than the Ulton 35/1.7 (and buy them used and save youself a lot of money)