It would be interesting to see karma-per-word, as well, as a kind of succinctness density factor. Although karma points are not equivalent to quality, and you’d need to also factor in average comment length and some other things.
To use myself:
31,273 karma / 351,012 words ≈ 0.0891 karma per word
A quirky feature of HN is that you can only see detailed karma counts for your own posts. One of these days I plan to scrape all of mine so I can sort by karma and do some meta-commentary.
Especially on political threads you'll see the most milquetoast takes imaginable basically locked at the top of the page because they were commented 2 minutes after the post was made, and all the fighting happens underneath.