I'll throw Korea out there since they haven't been mentioned yet. There is no direct benefit to culture, but 2 good indirect benefits. 1) Basically they will get a lot of extra science from playing a typical culture game. All those artist specialists and landmarks will provide +2 science each (+4 for landmarks after freedom finisher). Combined with the wonder benefit, it's a substantial boost to science. You can use that science to reach key techs faster (archaeology, radio, etc.) or just save some money on RAs and use it for culture city states instead. 2) their outstanding defensive UU makes them quite good at turtling. Defending yourself with just a few resource-free units for a long period of the game means you can effectively focus on culture better.