It's a later Panasonic design, so it's at least as good as the later Pioneer NTSC midrange players...
... which means it's leaps and bounds better than a 515 playing NTSC disks. Almost all the PAL/NTSC players except the 925 and DVL's (and *maybe* the 2950) have atrociously bad circuitry post-processing NTSC signals.
Others on forum.lddb.com might know more.