The Uran lens has the best color pattern in the entire set. I recommend using this lens as a reference for the colorist to match to. Most of the Mir lenses are flat, so since the colour of this lens is very natural and artsy. This lens can be a great reference for finding tertiary colors in the flatness of the mir lenses to get extra skin complexion into the shot.
This lens was converted from an Aerial mount. It has a back focus barrel, which is an adapter for the lens. The adapter is m42, which then adapter to EF.