With any of the Soviet lenses, much depends on the assembly. That is, was the lens assembled and collimated correctly? Or was it simply assembled and not checked for infinity focus.
All things being equal, a coated lens should perform better than an uncoated lens, in offering better contrast and suppressing flare.
However, don't be afraid to buy an uncoated lens. I have some uncoated Tessars that are very capable performers. And Krosya's attached photo is excellent. The flare has given this photo a very nice character that it wouldn't have with a coated lens.
Another side benefit of an uncoated lens is lower contrast, which sometimes is beneficial when photographing a very high-contrast scene.
One benefit of lens coating is that it can help protect the lens against cleaning marks. Cleaning marks can still be a problem, but you will find that uncoated lenses are much more susceptible to this type of damage, which can really affect an image.