I used to own the shift version of this lens in the Nikon mount. It's the same optically as the tilt/shift lens, without the tilting base.
It was about what you'd expect from an ex-Soviet factory...solid, heavy, very pretty coatings, with oddities that you just don't expect in modern lenses (in this case, no click-stops on the aperture ring which made it easy to knock the aperture away from where you'd set it, no indication on the lens barrel of which way was "up" for mounting the lens, and an aperture ring that would slide upward on the lens barrel pretty easily necessitating a visual check to make sure it was where it was supposed to be for each shot).
The biggest issue that I had with the lens was flare. Even though it had gorgeous coatings, it tended to flare at the first sign of a bright light anywhere near the image area. With a bright light actually in the image, it exhibited the worst veiling flare I'd ever seen in any 35mm lens (none of my old single-coated lenses flared this badly). Those coatings looked great, but apparently weren't helping much. Since I wanted to use the lens for things that would generally include sky (lighthouses, trees, and the like), I couldn't work with the lens. Too many shots ruined by veiling flare. I wanted to love the lens, but in the end I just couldn't work with it.