I hesitate to compare players like Okafor to Al Jefferson, not because I don't like Big Al as a player, but because I think Big Al's misfortune with injuries and having mostly bad teams around him has colored the perception of how good he is as a player.
Pau is so well regarded now because he's had the chance to spend the second half of his career playing next Kobe Bryant, and now Jimmy Butler / Joakim Noah / Derrick Rose etc. I think Pau is decidedly better than Big Al, but I wonder how people would look at prospects who profile similarly if Big Al had the chance to play on some better teams.