[semolino]

My read on HN comment sorting is that just like its frontpage, everyone sees the same comment page. New comments are added to the top, and quickly sink below others unless they are engaged with.

This is just a guess tho, as my account can't (yet?) see comment upvote counts.

[Jtsummers]

No accounts (except the actual admins/mods) can see upvote counts on comments. That was a deliberate choice from a long time ago for reasons expressed at the time (by pg, IIRC) that I can't seem to locate now. The site originally made them public, but eventually made them private.