I have had the opportunity to take the ICIS short course in image stability in 2006 and also to talk at length with Henry Wilhelm about the very questions you mention above. I have also been through the Image Permanence lab at RIT with Henry. Here are some of my thoughts.
1. Are you measuring dark or light stability?.
2. What is the temperature and humidity you will keep the images stored at?
3. What pollutants are present in the air?
4. What is your altitude and latitude?
I have seen direct comparisons of Kodak, Fuji, Agfa and Konica products side by side and I observe some interesting discrepancies. Fuji measures their light keeping at 500 fc (they win under these conditions) and Kodak tests at 200 fc (they win at these conditions). AFAIK, EK solved the yellowing problem back in the 60s. No material can stand up to UV or to some air pollutants such as SO2.
BUT, in comparisons with digital image stability, even prints, the chromogenic products win hands down. Added to the mix is image spread in inkjet prints. They dyes are low molecular weight and even though they are supposed to be anchored, they wander. This fact is hard to find on Wilhelm's web page, but it is (or was) there for all to see. And, of course there is the problem of magnetic image deterioration! None of that in film.
As for color accuracy and latitude, noting is better than the Eastman Color Negative films in both daylight and tungsten. But we cannot easily use it as this family is an MP film.