B757-200 CREW HAD AN NMAC WITH A PASSING MD80. THE B757 WAS LNDG ON RWY 28R AND THE MD80 WAS LNDG ON RWY 28L AT SFO. THE MD80 WAS INSTRUCTED TO MAINTAIN VISUAL WITH THE B757.

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ESTABLISHED ON APCH OUTSIDE SAMUL SWITCHED TO NORCAL FINAL CTLR. HEARD CTLR ASK ACR Y IF THEY HAD US IN SIGHT. ACR Y SAID THEY DID. CTLR TOLD ACR Y WE WOULD BE AHEAD OF THEM TO THE ARPT AND TO KEEP US IN SIGHT. SHORTLY THEREAFTER; CTLR ADVISED US OF ACR Y BEHIND US; ADDING THEY HAD US IN SIGHT. WE WERE THEN INSTRUCTED TO CONTACT THE TWR. AT THIS POINT WE DID NOT HAVE ACR Y IN SIGHT. AFTER CONTACTING TWR; NEAR SAMUL; WE RECEIVED AN RA ON TCASII. TO OUR SURPRISE; ACR Y (MD80) WAS DIRECTLY ABEAM OUR L WING AT OUR ALT PASSING US AT A RAPID RATE. WE TURNED SLIGHTLY R TO AVOID FURTHER CONFLICT. ACR Y MADE NO CORRECTIVE ACTIONS AND LANDED WELL AHEAD OF US. I MADE A BRIEF ANNOUNCEMENT TO THE PAX REGARDING THE CLOSE PROX OF OUR PLANES. SEVERAL PAX EXPRESSED CONCERN UPON DEPLANING. BASED ON THE RAPID OVERTAKE AND PASSING BY ACR Y WITH NO WARNING TO US THAT THIS WOULD TAKE PLACE (OTHER THAN THE RA) I BELIEVE THIS WAS AN UNSAFE SIT AND FILED A NEAR MISS RPT WITH NORCAL APCH. SUPPLEMENTAL INFO FROM ACN 591060: ON FINAL APCH; ACR Y WAS ON APCH TO RWY 28L. NORCAL ASKED IF THEY WOULD MAINTAIN VISUAL WITH US. ACR Y REPLIED IN THE AFFIRMATIVE. AT AROUND 1500 FT; ACR Y PASSED US ON APCH (SHORT FINAL). THE PROB OUR CREW HAD WAS THAT THERE IS NO WAY FOR THEM TO MAINTAIN VISUAL WITH US IF THEY ARE AHEAD OF US. THIS SIT OCCURS FREQUENTLY AT SAN FRANCISCO; AND SHOULD BE ADDRESSED. OUR MANUALS SPECIFICALLY STATE THAT WE ARE NOT TO PASS ACFT IN THIS SIT. THIS SIT SHOULD BE ADDRESSED WITH NORCAL APCH SO WE ALL CAN COME UP WITH SOME KIND OF GAME PLAN THAT WE CAN ALL FOLLOW.