While not having owner any Mir lens, rumour has it that there are better lenses out there for the money (also smaller), Some flare and CA, also identifiable in your picture, but nothing out of this world. Hope you enjoy your time with it though. (btw, what kind of processing did you apply for this photo?)
Speaking of me, I have found my best bargain to this day: an Industar 61 L/Z, for the equivalent of $12. I'm planning to give it as a Christmas present to my girlfriend, although I will get to use it as well (I hope). Since I purchased it, I became super interested in this lens, and Soviet lenses in general. I think many of them are great, and underappreciated gems, as opposed to the much-hyped Takumars (there's internet hype about some Russian lenses too, though, but not this one).
I have managed to pull out this picture with it, I hope she'll like it