I, too would be interested in more discussion of the ZYX house sound and especially any comparison to other brands. I have read a user of an Ultimate Omega describe it as 'jarring' compared to his Koetsu Urushi.
Having owned ZYX airy 3, Ultimate 1000, and Ultimate Omega, I can subscribe to the notion that there is a house sound to the brand: neutral and even handed. However, I also have an Audio Tekne and a Transfiguration Proteus, and I would say that these two cartridges exhibit the same sonic characteristics as Ultimate Omega, with different levels of resolution and dynamics. I assume that Koetsu and Miyajima would be on the warm side of ZYX while lower level Lyras' would be on the 'lean' side.
But even within the ZYX range that is the 'normal' Ultimate, and now the Exceed range, and in the US the Universe range. How does the old Universe ii, say, compare to the Ultimate Omega? How does the TOTL Ultimate ( or Exceed ) Astro compare to the Universe Optimal? Two different house sounds or ......?
Looking forward to answers.