That's more difficult to describe because the W3 highs are more different depending on what tips you use. The W3 highs are best with my UM56 custom tips and closest to the UM3X, slightly less and more rounded off sounding with Complys tips but not too dark (although less than ES5), slightly boosted and too much treble with single flange silicone tips and a shallow insertion (more the ES5), and darker with single flange if pushed as deeply into the ears as they can go (much less than ES5).
And this will change with different ears. I can't get them just right to my liking with the single flange tips like I can with the UM56 custom tips; and usually I'll just go for the long medium complys if I left the custom tips at home. With UM3X I prefer the single flange silicone tips and a medium depth insertion.