I don’t know a lot about this in particular, but I did go look up the tessitura (range, vocal quality), and it seems it requires a dramatic coloratura soprano who can sing up to F6 (above the staff). That means she has to have thick enough chords for the power, but be very flexible to do the coloratura (vocal ornaments, basically), and have an extension above the normal high C6, without depending on cord lightening techniques.
In short, it’s the rarest written vocal fach (type of voice), but that doesn’t mean it’s all that rare when you consider the large number of singers in the world. I wish I could give you actual numbers, but I’m not able to find them. But maybe knowing the fach will help (dramatic coloratura soprano).