The 656A is basically a 757AI without the HDMI (High Definition Multimedia Interface) and should have the same 12bit/108mhz video dac (effetively it's a 747 in a new shell, i think... I may be wrong...

).
Furthermore it will also be one of the few dvd players on the market that is CPRM

compliant (copy protection flag broadcasters can use to inhibit playback of recordings made from digital broadcasts).