From what I've read, films have about 10 stops of light sensitivity but they compress that to about 7 stops of resulting dynamic range by being nonlinear in both shadows and highlights. The output dynamic range is comparable to digital.
Digital is linear over its range so it is less tolerant of high contrast images even though its output capability is comparable to film.
There's no way to compare the actual dynamic range of a slide to digital on a web page since you are converting it to digital! Still, scanners are capable of very high dynamic range.
So, I think it's correct to say that film has greater dynamic range than digital (currently) but also that herb's observations are correct. Additionally, I believe film's nonlinear response in highlights varies between red, green, and blue and that may contribute to it's excellent performance in blue water and into-the-sun shooting.