upgrading CD player results

After recently upgrading my amp to a Conrad Johnson MF2250, I decided the front end needed a facelift. I was running a Marantz CD67SE into a musical Fidelity X10D (with upgraded ecc85 tubes), feeding an Adcom GFP750 preamp and Paradigm Studio 60 speakers biwired. VHAudio Pulsar interconnects all over and a flavor 1 PC on the preamp.

After much thought and research, I bought a Cary 303/200 to replace the Marantz/X10D front end.
Much to my disappointment, it really isn't an improvement!
It sounds a tad cleaner, the instruments are a little better defined in the soundstage, but the difference is really very small. I thought going from a circa 1999 player to one with upsampling and HDCD would be significant, but alas this ain't so. Maybe the preamp is unable to pass the improved signal? The reviewers call the Adcom a giant killer, that punches way above it's price.
I auditioned HDCD disks, redbook discs with and without upsampling, tried running the Cary throught the X10D (it sounded almost identical to the Marantz then) and have concluded that I actually prefer the old setup, it's not as clinical sounding.
Also tried the Cary directly into the amp, didn't find that sounded very alive.
Guess I'll be selling the Cary, really suprised that this wasn't a quantum leap forward.