Every song has a leaderboard, but there is no overall board. As I was curious, I counted, who is No 1 in the most songs, and those are the results (on 27 March 2020) for the sword fighters. It's not so much variation there, the whole sword fighting area is dominated by basically 2 players:
I thought it would take me some time to write down the leaderboard of the people of SHIELD ;) But no, it was easy, as OSL dominates the field. Don't try to shoot arrows at him ;)
There is either no competition in the shield section or OSL is a effing good player!
Finally, I also counted the hammer heads, that's where I compete:
And leader in one song are (Things may change over the time, maybe I'll update from time to time):
Amber.dominguez.963
AndreGamer4Life
asher12
Blaursen
brad.j.higginson
chris-bot
DogLover28
patelucas7512
Saphira94
shell01
Sleclt
thierry.masquelier.3