You can't help but compare Punk with Raven, both are amazing with a microphone in their hand. Punk is miles ahead of anywhere Raven ever was in the ring.
If you want to piss off Punk, compare him with Raven. Punk, aside from the look with the tattoos actually has closer comparison to Douglas, if you look at his Summer of Punk program in ROH.
Can't make everyone happy, I think that is just the best comparison. I think everyone else knows it as well, since C.M. Punk was the first guy matched up with Raven after Raven was released from WWE.