Gave my thoughts on the Valkyrie vs Legend X, but one additional comment would be that I found the highs on the Legend X slightly more forward than the Valkyrie
Whilst the Legend X and Valkyrie are very much a V-shaped signature with fun, the Phantom is more neutral and referencing sounding. It has a larger soundstage, more precise mids and highs with slightly subdued bass as you'd expect from the BA design. You get more detail in the mids and highs with the Phantom over the Valkyie, with a slightly tighter but much less punchy and fun bass.
If I'm talking about the Phantom then I have to mention that the Wraith takes all the detail you get in the Phantom and dials it up to 11, I could almost feel/visualise every note and the instrument separation was astounding. The subdued bass means that it's much more enjoyable using it whilst listening to something that doesn't need a lot of bass such as orchestral, pop or jazz
I've owned my Solaris since it came out in December last year so I've listened to it for a long time now. It has a massive soundstage, I previously owned the Andromeda which I thought was big but the Solaris took that and made it even larger. The sound is much more neutral and sounds very natural, and with the hybrid design the bass is pronounced enough to get your foot tapping
With the Legend X the bass is much meatier and punchier, the V signature is more apparent on the Legend X whilst the Solaris has a much slighter curve which means it is significantly more fun listen. I couldn't help smiling when listening to rock and hearing the bass & dums kick in. The soundstage is slightly smaller than the Solaris but still large enough to feel immersed in the music. I did find that the mids and highs were comparable between the two in terms of forwardness and accuracy, perhaps even better accuracy given there's a drop in mid-high frequency on the Solaris which is sometimes quite apparent but didn't pick up on any Empire Ear IEMs. The Solaris still trumps in terms of natural sound, but that was the case with all the IEMs I demo-ed (including the Wraith)
I found the bass between the two extremely comparable actually, to the point that I didn't realise they were constructed differently which means I didn't feel the Legend X's bass was lacking at all. If anything the bass was probably slightly louder on the Legend X, but it may have been actually boomier instead? I would have to perform a much closer A/B testing to better tell their difference
I'm still pretty new to the whole technical side of IEMs/headphones hence as you can tell my opinion is relatively loose
absolute great fun demoing at the Empire Ears booth though[/QUOTE