it wouldnt be as easy for safin as some are beating their bananas at.
Well, the OP did say "peak". And peak safin would beat peak nadal on hardcourts everytime.
That said, "peak vs. peak" discussions are pretty pointless.
If Nadal and Safin "just played", Nadal would probably win most every time. The current record is 2-0 in favor of Nadal, both matches played on hardcourt.
Even a guy like Robredo or Santoro has a winning record against Safin (even on hard courts).
In reality, you would never see "peak Safin" against Nadal, because Nadal would not give Safin the kind of balls and rallies the produce "peak Safin".