I don't have anything concrete for you, but I'm quite happy with my quality and speed. As a kid I wrote only in cursive, but it has too much backtracking.
Now I write in more of a standard font but I don't pick up the pen very often. That's where the speed comes from.
For legibility, I've focused on each letter intently throughout my entire life, to the point where I basically have a font reference in my head.
Each letter and number has a standard. I spent a long time trying to make each one perfect, but now it's second nature.
As long as my writing platform is good, and I have a 1.0mm G2 pen, I'm good to go.
Now I write in more of a standard font but I don't pick up the pen very often. That's where the speed comes from.
For legibility, I've focused on each letter intently throughout my entire life, to the point where I basically have a font reference in my head.
Each letter and number has a standard. I spent a long time trying to make each one perfect, but now it's second nature.
As long as my writing platform is good, and I have a 1.0mm G2 pen, I'm good to go.