How does Sony XA9000ES compare to ext dacs on cd?

I am curious to know how from Sony XA9000ES owners and listeners how its redbook performance compares to available external dacs such as ECD-1, Kora HermesII, Dodson. I am trying to make a decision on digital upgrade soon and am considering all the following options. I will probably using a Yamaha S2300mkII for a transport for the time being with external dac if I go that path. Any advice or opinions would be greatly appreciated. My listening preferences are basically everything besides classical, haven't acquired a taste yet. My system is as follows: Krell KSA-100S, Krell KRC pre, Yamaha S2300mkII, HK-avr7200(for ht), Coincident Super Eclipse speakers, Martin Logan Grotto sub, Audio Magic Stealth power cond, Acoustic Zen Siver ReferenceII, Audioquest Cheetah, Audioquest cv-6 dbs sp cable. Thanks for your needed help.