When was Joe Calzaghe's Prime?

[AGM]

He may have hit harder when he was younger but I'd have to put his prime at Lacy-retirement mainly because I don't think even he realised how good he was until the Lacy performance. I remember him saying how he didn't sleep the night before the Lacy fight, which was the first time he was ever like that pre-fight. Also, his whole personality and demeanour changed after that victory... He believed he was unbeatable from that point on imo.