SACD/CD player update

i have invested on analog for a long time. From vinyl to Reel to Reel, VPI turn table to tube preamp. But sometime i looked at my shelf, there are still over hundreds of SACD and red book CD over there. also some Hi-def in my hard drive. I only have an Oppo 105 to play them. I wonder if it worth to invest on a better player. Thinking about Esoteric, but i never do  A-B comparison and don't know how much i can gain. I'd like to hear some advice. Thank you.