It seems that if you look at the column on the right of the page, you can see upvotes and downvotes separately for recent posts. The same [n, m] format is displayed for recent comments, but it doesn't seem to actually sync with the score displaying on the comment. This feature only seems available on the sidebar: looking at the actual comment or post doesn't give you this information.
Thanks, whoever did this!
I noticed today that hovering over a user's total karma score displays the percentage of positive votes; didn't realize it was in fact a new feature until I saw this post. It came as something of a surprise to me to learn that my karma of 53 is in fact 56% positive, which implies a total of around 440 votes. I wasn't aware of being this controversial.
I wonder if displaying the total positive and negative votes instead wouldn't be more intuitive, though; especially with comments. As Emile pointed out, it would also convey more information.
Edit: I thought there might be something fishy about this...