XA5400es for redbook CDs

I'm well aware of the ES's reputation as a great SACD player. However, how good is it as a redbook CD player?
I replaced a fine sounding Sony DVP-S9000ES with a SCD-XA5400ES, and was struck by the improvement in redbook CD sound. My impression is CD playback got a lot of attention in the design of the XA5400ES. A well recorded CD leaves little to be desired when played on a XA5400ES IMO.
The improvement comes mostly from the better platform of the 5400 which reduces the jitter, including a super clock. Great machine.

If my setup uses outboard DACs and that's how I would use the XA5400es, is it worth it to add to my system?

As for jitter, I would assume most will no longer talk about it after the updated digital lens comes out.