Transparency film is a league of its own. Not only on a light table, but even more in projection!
It is absolutely impossible to get such a quality in digital imaging:
The three-dimensionality of a slide is unique. Digital images are looking very flat in comparison.
The color brillance of chrome / reversal film is also unique. The detail resolution of slide projection is decades ahead of digital projection, which only offers tiny 8 MP resolution at best, and that at ridiculous high prices. I have done lots of side-by-side comparisons, and digital projection just sucks. Slide projection is king.
Yes, and Velvia 50 is really awesome. There is a reason why it is such a legend and "the" landscape film.