I used Velvia quite a bit for subtle lighting conditions. We get wonderful lacey coastal fog here, like a natural soft box with various degrees of diffusion different times of the day. There are certain hue distinctions in the greens where Velvia is the most accurate film out there, provided one has a lens
equal to the task. But using Velvia simply to get loud colors in "standard" lighting means you are going
to have some serious printing issues. I've made plenty of Cibas from Velvia, but it's a chore. But, of
course, if the lighting ratio was modest to begin with, it was a perfectly ordinary printing situation.
Now Kodachrome and Ciba ... that was a marriage made in heaven! Yet the originals were tiny, so I
typically made 8x10 dupes on Astia etc to actually print from.