I bought and very much liked, but ultimately ended up returning the hyla te5-b because between the Solaris and the atlas, it did not provide enough new or clearly superior for me to justify keeping. Compared to the Solaris, it had significantly more bass quantity, particularly mid bass quantity, and more overall bass slam and is a decidedly V shaped, more typically ‘fun’ signature compared to the relatively balanced signature of the Solaris.
The bass on the hyla’s is a thing to behold, probably the most authoritative of any earphone I have heard (including my atlas and the legend-x, which I have only heard briefly), but it is quantity-wise very north of neutral. The Solaris is far more neutral overall. However, when it is in the track, it provides authoritative sub-bass slam that to me was equally satisfying, though less augmented than the TE-5B. As I mentioned, the te5b has a lot more mid-bass quantity than the Solaris, which does impact the te5b’s mids. The Solaris’ mids are lusher, fuller, more textured, and more forward. Comparatively, the Hylas mids were definitely a step back from the bass and treble and slightly veiled. The te5b treble has a more crystalline, harder edged, and splashier (not in a bad way) character than the Solaris, although neither earphone is harsh. There are similar levels of sparkle in both, with the Solaris having slightly airier, but simultaneously lusher treble. Overall, both have outstanding treble, just with different characters.
Soundstage-wise, both are above average, but the Solaris was wider and airier while the hyla had a more in your face, wall of sound type presentation (though not as much so as the atlas). The Solaris has noticeably better layering and instrument separation—areas it truly excels.
I really liked the hylas, they are a fantastic pair of items, but in the end returned them because they did not provide enough new and unique that I did not get already between the Solaris and the Atlas. I hope that helps!