It's only possible to see the vote count on your own comments, so OP must have been referring to OP's own comments. One way to check your comments' vote count is to go to your /threads page, but if you have a comment that is threaded underneath one of your own comments, it will be harder to see because it will blend in with all the other replies to your original comment.
I have found that it is very rare that one of my grandchild+ comments attracts more upvotes than my original comment though, so I don't concern myself with these comments much.
Do you mean see upvotes to your own comments? Or see upvotes to comments in general, including those of others?
If the latter, how do you "see" them? Is this something hidden until I have more HN points (like the downvote "superpower," apparently)?