In regards to your question about cables, I have Focal Elex and Sony MDR-Z1R headphones, which both have the same connectors. I've used a few different cables, mostly mid-grade to inexpensive cables.
To me, there is not a noticeable difference between cables, which is also my experience with interconnects, speaker cables, etc.
I buy cables for fit and finish, length, different connectors (balanced, single-ended), not for sound quality. Which isn't to say that there aren't differences in sound quality, but that unless I A/B them back and forth repeatedly, there aren't differences noticeable enough (to me - your hearing may be more sensitive) to make me prefer one cable over another.
To me, there is not a noticeable difference between cables, which is also my experience with interconnects, speaker cables, etc.
I buy cables for fit and finish, length, different connectors (balanced, single-ended), not for sound quality. Which isn't to say that there aren't differences in sound quality, but that unless I A/B them back and forth repeatedly, there aren't differences noticeable enough (to me - your hearing may be more sensitive) to make me prefer one cable over another.