I use to be madly in love with comics as a young teen. These days, I appreciate the art but don't get into them like I did as a kid.
Copacetic comics is above Lili and I was intrigued by the store enough to climb the stairs and check it out.
I'd say they specialize more in graphic novels than comics which is a good thing. Most of what they carry could be considered literature, if you stretch the term out a bit.
The lady working the register was really nice and we had a good conversation about the Black Keys. I didn't end up buying anything but I spent a while appreciating the artwork. I also noticed their extensive "self-published" comics from local artists. This is great and something I never knew Pittsburgh accommodated.