Well, I do think that "simple Canare, Mogami or Cardas cables" let more music thru than the akg included cables.
I should clarify that I didn't notice any difference in sound between most stock cables and those that I built. There are exceptions and one was the stock cable of my old ATH-M30, I did the removable cable mod and there was a slight difference in sound with the new cable, just slightly better dynamics, not easily noticeable but confirmed by my GF and her friends after I wired up the old stock M30 cable with a 3.5mm plug just to test.