What the Difference 20/BIT&24BIT CD Player

HI ALL

HARRY HERE FROM CALIFORNIA

HAVE A DENON DCD-1520 CD PLAYER.THE THING IS BUILT LIKE A TANK YET ITS 20/BIT 8 TIMES OVER SAMPLING.HAS OPTICAL/COAXIAL DIG.OUT

I USE IN MY SET UP

PRE-AMP-ADCOM GFP-565

AMP-HAFLER DH-220 OR ROTEL RB-1050 OR KRELL KMA-100 MK2'S

CD PLAYER - DENON DCD-1520

STEREO TUNER-SEA TWO T-14

TURNTABLE-TECHINCS SL-D202 W/EMPIFE 2000 E/111 (THE MRS. AND I CAN REALLY HEAR THE DIFFERENCE IN VINYL VERSUS CD THE SOUND SEEMS MUCH FULLER IN THE VINYL)

SPEAKER-PIONEER ELITE TZ-F700.USED AV RECEIVER ON THIS SPEAKER BUT THERE WAS A PROBLEM WITH (AS FAR AS WE COULD FIGURE OUT WITH THE HELP OF LOCAL TECH).THE 300 WATT BASS AMP.INTERNAL CAUSED MY AV RECEIVERS TO BURN UP.NOT GIVING UP ON THE JAPANESE ATTENTIVE EAR I WENT TO THE ABOVE AMP'S

INTERCONNECTS. ARE NOTHING GREAT.

ALL SAID AND DONE MY QUESTION IS SHOULD I UP GRADE MY CD PLAYER? I THINK THIS WAS BUILT IN 1990'S???

THANK YOU ALL IT'S A PLEASURE SHARING.
HARRY OTTO