NMAC IN A XING TFC SITUATION DURING A VISUAL APCH PROC TO MULTIPLE RWY OP PARALLEL RWYS.

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WHILE BEING VECTORED FOR VISUAL; 26L; DENVER INFORMED OF ACR MDT WHO WOULD BE MAKING A VISUAL TO 26R AND WHO WAS THEN AT OUR 10 O'CLOCK POS. MY FO STATED TO TRACON THAT WE DID NOT HAVE TFC IN SIGHT; OUR CTLR STATED THAT THE OTHER ACFT HAD US IN SIGHT AND SUBSEQUENTLY CLRED US FOR THE VISUAL TO 26L. SHORTLY AFTER CALLING THE LCL CTLR; PASSING ALTUR (LOM); I WAS A BIT NON-PLUSSED TO ACQUIRE THE MDT Y AT OUR 11 O'CLOCK; TURNING BASE IN FRONT OF US; IN SUCH A MANNER THAT HE CROSSED DIRECTLY OVER THE FRONT OF OUR ACFT (VISIBLE THROUGH EYEBROW WINDOWS) WITH A VERT SEPARATION OF NO MORE THAN 300 FT. FROM ABOUT HALF WAY THROUGH HIS BASE ENTRY TO CERTAINLY THE POINT OF OUR ACFT XING THE CREW COULD NOT HAVE HAD US IN SIGHT; ALTHOUGH WE HAD AN EYEFULL! CALLED TRACON AFTER LNDG TO DISCUSS THE INCIDENT; AND EVEN THOUGH I'M AWARE THIS WAS A LEGAL APCH FOR BOTH OF US; THE WAY IT WAS ALLOWED TO DEVELOP WAS IMPRUDENT AT BEST; AND CERTAINLY UNSAFE IN ITS EXECUTION BY WHOEVER WAS FLYING THE MDT. IN ANY EVENT; I FEEL THIS PROC AT DEN (AND LAX TO NAME ANOTHER) NEEDS AN AUDIT; AND I TOLD THE TRACON SUPVR I DID NOT WISH TO EVER SEE A REPEAT OF THIS INCIDENT WITH ME IN THE COCKPIT.