A film with a different look. More saturated colors. The toe areas of the sensitometric curves are matched more closely, producing more neutral highlights on projection.
Cinematographers can be more creative with lighting and exposure, and still see remarkable results.
And there are no color shifts during fades and dissolves. So, from set to lab to screen, day to day, you'll have more consistent performance. These are not incremental improvements. They are quantum leaps forward in film technology.