A medium quality scan might give good results even with 120 film, but might fail to render accurate
color with 35mm because the sampling error affects not only detail, but much more significantly, how
the system resolves transitions in dye curve geometry, which can be effectively altered one curve
relative to another. A lot of things get blamed on the film which have nothing to do with the film itself. When one optically enlarges, however, it's mainly just an issue of saturation related to degree of magnification. This can be altered one way or the other using basic unsharp marking techniques,
which don't alter hue relationships per se if correctly applied.