I'm not sure if the comment system currently works like this or not, but I think having it work similar to the regular feed would be useful. That is, comments that have been shared by people you are following will be more towards the top. Not necessarily comments by those people, but the comments they share. That way the user would be doing essentially the same thing with comments as they are with submissions: curating what their followers see. As it stands, the current system shows me comments that are shared by anyone and that's not necessarily what I want to see. In threads like the "what are you listening to" I might want to see comments by people who like the same type of stuff I do and as such would like to see who they decided to share (rather than just a general consensus).