I just created the Chase CPC Wikipost. Some is public content.

The difference of CPC vs. Sapphire is really small. The major difference is that CPC has a dedicated banker vs. the Sapphire dedicated phone line. But I have a lot of contact with my banker at the branch. So he is my (personal) banker regardless of the CPC status.

CPC was a good way to get around Chase 5/24 or for higher bonus or the Reserve card. But those are gone.