Its not easy to get all opinions being 100% true. You would have to take into mind that the people who made the purchase and spent good money doing so have a coloured view leaning toward "yes, cables make a better difference" Then we have the Big Fat Audio HiFi Market who pay people with freebies to write a good review, plane tickets, world cruises. I have been on any number of forums in which those who make the profits actually are those who founded the forum to begin with, pay out in prizes, freebies to forum members ....
In my opinion I try to read many,many personal views about the headphones or amps I want and glean what seems true and relevant.
With all that, still its easy to be fooled. Best just to listen to the headphones themselves and check the forum for brand problems.