The results I am getting with my 925 are pretty comparable with Karyudo's - as you would expect.
The X0 certainly looks to p*ss all over the 925 wrt chroma artefacts/combing. However, I suspect there is something more than just the player. Laserman, didn't you say you were using a "broadcast-quality" capture system? What are you using Karyudo, a BT-878 card?
As I understand it, the 925 applies a comb filter to the composite signal from the disc, does a bunch of processing, and re-combines the signal for the composite output. It would be preferable to get an untouched composite signal and process it with "broadcast-quality" comb filters, which I assume is what is happening with the X0 captures?