I am currently using a K01XD so I am very happy to learn you are experiencing such a rewarding musical experience with your upgrade to the K01XD SE. Hope it keeps getting better and better. Enjoy!
One of the reasons I went to the FLAX 2025 was to listen to the SE versions of the Esoteric DACs. I briefly listened to the K03XD SE in a system including (iirc) Block Audio and the Clarisys Piccolo. It sounded very good but it was hard to get a feel for what the K03XD SE was contributing. Needless to say it was not the weak link. It fit right in and played well with the other components. Really nice sound.
Eventually I spent a more lengthy time in the Playback Distribution room which had a full Esoteric Grandioso rig that was, for me, one of the highlights of the show. While they mainly played analog through the impressive T1 turntable and the new Grandisos E1 2 box phono stage (which was the finest analog I heard at the show), they also had the Grandioso K1X SE, the new Grandioso N1T network transport and the Grandioso G1X master clock for digital playback. I was able to hear familiar tracks from the N1T into the K1X SE internal DAC/G1X clock. This was extremely impressive considering the high quality of the analog presentation. They were also able to play one track (I think it was a Louis Armstrong track) in both the vinyl and digital versions for comparison. Both presentations were wonderfully dynamic, with a fabulous soundstage and sense of air around the instruments. I could easily live with the sound quality I heard from either. Other than the digital I heard from the incredible Clarisys Atrium room, this digital playback was as good as I heard at the expo in a more "real world" (haha) system.
The challenge for me now is to figure out do I upgrade to the Esoteric (K01XD SE) or Grandioso (K1X SE) product? On the other hand, there is the remarkable MSB Cascade DAC that brought its digital magic to the Clarisys Atrium room! Ah, it's tough having first world problems these days.