I wouldn't trust scans or internet posts to be indicative of color characteristics of any lens system. Even color prints are interpretations. Judge from color transparencies, and then on a good light box or in projection. You need to eliminate variables other than the lenses, which would include all interim steps where color can be manipulated or reinterpreted. If you're judging from prints, you'd need a standardized color target printed with appropriate care and consistency, or a very large sample of prints from a very good (human) printer, but even the choice of color paper would affect the color "signature". Comparing prints on Fuji paper to others on Kodak or Agfa will not really tell the story about the lenses alone.

A good "neutral" transparency film is what I use to judge lens color characteristics.

Lee