Maybe what I have learnt so far might be interesting for others to hear about as well. There are a couple of negative things about this film 1. The price tag. It's useless in poor light or for motives with lots of shades. This is not typically a Velvia phenomenon, but rather a problem with all slide film.
Skin tones are sort of crappy.
It's a heck of a UV sensitive film. Most of the pictures turned out to be no-nos. Velvia inside using the 20mm Nikkor and that in strong sunlight without UV filter. I am still not sure what this is all about, since any other combination seems to work ok, e.g. using the same lens and Velvia on Ilford Delta 100. I will most definitely investigate this further and post my results on this page.