The Zeus is one of the most "naturally" resolving things I've heard - it does have a forward midrange, so these details are further accentuated, but I think even if not, it would potentially edge the Solaris in mid range micro detail. It has a way of sounding smooth but still spitting out the smallest nuance in a track which is unlike anything else I've ever heard apart from a brief audition of the Jomo Flamenco at Canjam.
With the Solaris, there is still a ton of detail in the presentation (especially in the bass - those textures are incredible), but some of it sits in the background, overshadowed slightly by the more emphasised frequency ranges. For me, it is definitely top tier in terms of resolution and clarity, but not the final word compared to some of the detail monsters out there. It trades that for the superior timbre, tone and soul that gives it its inherent musicality.
To give you a good example, I use a track called "Palladio" from Escala as one of my go to review tracks for string instrument textures. It has a little bit of clicking / room noise around the 30s mark on the lower left side from someone adjusting a chair or a music stand. On my Flares Pro or Echobox Finders, this noise is heard quite clearly in the foreground. On the Zeus and the Solaris, you have to strain to hear it, but it is still clearly there if you listen out. The first two iems are good mid-tier DDs, but in no way are they anywhere near as resolving or detailed across the spectrum as either the Zeus or Solaris. They just happen to have a particular emphasis on the cymbal ranges, which is where this particular piece of plankton seems to live.