In my own, admittedly limited, experience (I mean, I'm 24, there's people here who have been into this stuff for longer than I've been alive), cables can make a difference. But there's a caveat. Usually, if a cable makes an audible difference, it means one of them is bad in some way. That can mean high impedance (per unit of length or even just because of pure length, I had daisy-chained 2 3m cables together to reach from my TV to my MSR7 at some point and the sound was definitely affected, being thinner and less detailed), poor shielding (so there's EMI noise), poor soldering, poor connectors and any number of things. With my father, who's been flirting with audiophilia since the early 80s, we've stumbled across many of these cables. When he got his current Vienna speakers, he forgot to get RCA cables to connect to his receiver and stuff. So he had me run to a local store to get a few cables while he was setting up. So I went to the store, got 3 identical cables and went home. Nice Vienna Baby Grand Beethoven speakers and PrimaLuna Dialogue II tube amp and it all sounded like noisy crap. It's been almost a decade and I can still remember the disappointment in his face. Turns out, the shielding on these cables was so poor that even a smartphone at close range would mess them up, never mind them being on a cabinet full of electronics. So we ordered a nicer 10-15€ cable and got it the next day. To this day, this setup he still owns is among the best I've heard. But then, he got curious and thought that cables can indeed make a huge difference. He and I learned what I described above the hard way. We visited an audio show in Athens where he got a 3 digit cost cable. It was a silver cable with huge shielded connectors and had this beautiful thick outer sheath that was supposed to protect the signal and sound delicious. We went home. He hooked it up. He got the same disappointed face he had the first day. There was NO difference in sound. We connected the 2 cables to different AUX ports of the amp and 2 different ports on his receiver, so we could A/B. There was no difference, period. He even had me connect them and not tell him which is which and still, nothing. Oh the disappointment...
So, to this day I refuse to believe that a magical cable can provide a quality boost over a good quality "cheap" cable. If it can't do it on a ~5.000€ or whatever it cost speaker setup, I highly doubt a headphone can benefit. WIth that said, there's a point where a better material can improve things, but that's far lower than many sellers will have you believe. So, again, for me, the only valid reason to get an expensive, nice cable is because "screw you I like it and I can buy it". I'm not going to argue with people claiming otherwise, I'm not omniscient. Others may be able to prove me wrong. Until then, I'll just continue buying and advising the same way I have until now.
PS : I'm really tempted to mod the 58x, but I adore their sound as it is right now. I'm just getting an itch and I'm trying to resist scratching it.