I have seen Agassi against Karlovic (an even better server than Pete), actually i have the match in the highest quality available at the time. Yes, i have seen Agassi return Karlovic's serve 2 meters inside the baseline.. yes, i have seen Agassi return a 136 mph slice serve full stretch with an outright winner (which is one of the most amazing return of serve i have ever seen)..Disagree completely! Djoker has never faced a serve like Pete's. Agassi could hit outright winners from 140 mph serves and consistently get the return back in play. In addition, most players putting the importance of speed over placement in this era would make Agassi's life much easier if he were barely 30 nowadays.
Still... I would take Djokovic consistent return of serve any day of the week over Agassi's.