Not explicitly.
Implicitly, I thought it was fairly well established that the Federal AI + Ships dominate CZs compared to the other factions. The imperial capitalship is has pool noodles for guns, and the Empire's severe shortage of medium ships means it's severely outclassed in all CZ spawns. Alliance and Independent lineups are a bit better, but still not as powerful as the Feds.
As an Imperial supporter, I always thought CZs were pretty tough, until I went and fought for a Federal faction (during a CG). I couldn't believe how reliably I could blitz High CZs in quick time when supporting the Federation.