Well, Velvia 100 has higher contrast, saturation, and less shadow and highlight detail over Provia 100F. Velvia 100 seems to enhance red and magenta more so than any other Fuji slide film, and is not really a film which I've ever accepted compared to RVP 50. I find Provia neutral perhaps varying a tad cyan on occasion depending on light conditions. There's a good comparison of the various slide films on the same subject on, Tim Parkin's Great British/ On landscape website.