A more modern lens would have better coatings, which would help with color, but other than that there is no reason to feel that an old lens is inferior to a modern lens, particularly with fixed focal length lenses. Old film tech was really bad, so the lenses had to be great. The Zeiss Planar lens on my Rolleiflex (made in the 1950s) is possibly the sharpest lens I own; I'd put it up against anything modern.