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.
Seems simple enough, while searching I came across this snippet you can paste in the console, and gives you a sorted list of most upvoted/downvoted comments: >>36107028
Sadly requires hitting news.ycombinator.com rather than the API, but only way to get the actual points as you mention.