Have people commented more? Does user karma matter?
Are there more "quality" posts?
Is there a different subset of users posting?
Probably too early to tell, but it would be nice to see what happens when you take karma away from comments. I am trying to imagine reddit without it and it doesn't seem quite as interesting. Some hard data would be cool to look at.
Fundamentally, removing them has changed the balance of what karma is all about. Karma previously had a function for the reader. It highlighted and bubbled up the good. It showed where there were good counter points. Now...well it's just for the account owner. It feels just like it's there for your own rpg-levelling style dopamine hit. It feels pointless.
I really feel this is a mistake. Comment karma had a function for readers, not just for account owner's inner satisfaction. This role has now been lost. It's making browsing comments - especially for very popular topics with lots of comments - much harder. I'm skimming a lot more or actually skipping the comments altogether because I don't want to read them all to find the goodness. It also means people can't learn from others what is or is not a valued contribution.
So I really hope this will be reversed or at the least make a better way (more than just what is the top comment) to make karma benefit the community not just the individual.