Tabl10s, the Oracle 2000 is a marvelous pce. and eye candy to boot and really enjoyed. In my system it was very musical and even though Oracle refers to it sounding it's best via BNC connection I preferred AES by far with my dac anyways.
MBL 1621A, in my system all areas across the board are improved which is pretty amazing. The only area I preferred the Oracle was I felt it was ever so slightly more musical, this is slightly though. Now this was using the Oracle with AES connection which was my preference, I found myself connected to the music with my toes always taping along with sometimes finding myself singing along but not so when BNC connected. The person who bought the 2000 also wanted my AES digital cable so I reluctantly sold it thinking I could pick one up used easily but this has not happened. I have not yet had my MBL hooked up in AES configuration, I'm currently using the BNC. If you refer to my initial info. saying improved in all areas and my feeling when using the Oracle with my preferred connection AES should say allot and hope once I get around to getting another AES conection will hopefully be another improvment like with the Oracle, that would really be nice but even with the BNC curently is pretty amazing.
The MBL was a no brainer upgrade, one thing that was interesting was I demoed the matching dac but still preferred the AA Hybrid Dac.