Playing v8 and I have a few things to comment on, some good, some bad. This is played on emperor, huge, 8 civs and 16 CS (for room to expand and move).
The good:
1) The current leader - Germany - has cities that are bigger than mine. My capital is at 24 pop. Berlin is at 29! My other cities are hovering around mid-high teens. Germany is averaging around 17 for the older cities and 6 for the newer ones. Granted it's only turn 100 (350 bc) but it's still a promising sight.
2) Germany has more cities than I do. I don't know if the second round of expansion has kicked in yet because this is my first game with the new patch, but right now they control more territory than any two civs combined.
3) Money seems to be reasonable. I was only barely possitive before I researched currency for the market and the bonus to trading post. It also seems the ai is haddling this well; of the four that I have met, only one is in the red (-71), while the wealthiest is cruising at +120.
4) Technologically the ai is keeping pace (Germany is already in the renaissance era at 350 bc, while I just broke into medieval).
The bad:
1) I'm not winning
Ok jokes aside this is a great improvement to C2PP balance. If you had not already started the sweeping yield changes and associated cost hike of v9, I would have just recommended that you just fine tune a few things in this version and then call it a day until the multilayered techs/policies are finished. However, since you have started, if you keep things in the same general ratio as they are currently, I think the balance will be maintained.