Djokovic is better than Murray and Safin is better than Berdych, so not really the same situation.
Not to mention that, as Leng Jai pointed out, that could happen in todays conditions. In a faster court Safin would blow Murray of the court.
I said previously that I dont know how successful Murray would have been in the early noughties, because big booming 1-2 tennis is not his natural game.
And yeah i imagine Safin vs Murray on a fast court would mainly go to Safin. And Safin Murray on a slow court would mainly go to Murray.
Re- Berdych - Djokovic rivalry I was just trying to highlight how big serving and attacking tennis can be completely nullified by great defenders and counter punchers to a devastating one-sided effect.
Its true peak Safin is most probably a better player than Berdych, but Berdych didnt have the benefit Safin had of playing on courts that suited his game.