mate, having not heard the ES3X and what areas if any there are weaknesses I cant possibly tell you that; but I will say every other occasion I have used piccolino in my cables; (check my sig) it has been significant to say the least. i'm a cable believer anyway, but this stuff ticks all the boxes, its almost like its an active component IMO not its nature (its nature is truly transparent, but the profoundness is so that it seems more than just a cable). light, flexible, tough, pretty, made of the best materials known for audio aside from no wire at all (7N pure silver/gold) and scientifically sound (coaxial and shielded) for me it made a big improvement in the blackness of the background and extension as well as avoiding ALL of the potential pitfalls of silver. its not peaky, sibilant or harsh; but is clear, extended and just plain marvelous. BTW I have no affiliation with CC, steve is a friend of mine, as hes an aussie too and has been of great help to me, but this has nothing to do with my recommendation. if the money isnt so much of an issue, I cant recommend any cable more readily and steves work is superb. ask darkopi about piccolino (his whole rig is made of it and he has several sennhieser cables or headphoneaddict who has LODs. I cant remember the guy I know who has the livewires cable, but there is an extensive review on here about it. hes an aussie too.... man. cant remember; i'll see if I can find a link for you.
edit:
found it