Personally the most punch perfect fight I saw was IMO Chavez's peak performance, his 11 round destruction of Edwin Rosario.

And if we are talking perfect punches, you can never beat Ray Robinson's 5th round KO of Gene Fullmer in their second fight.

Ray Robinson was meant to be at his best against Tommy Bell when he finally won the World 147lbs title.

I always admired Duran's destruction of Ray Lampkin, although he was not that impressed himself, with his:

"I had been in shape, they've be taking him to the morgue" (not the hospital).

So maybe Duran's victory over Carlos Palomino was his best...