Received the ZSA today, and I have been comparing it to the kz s5 all day. My findings are these: Sound: very V shaped. The s5 had a peak around the mid highs, the ZSA has a peak in the highs. Very piercing highs and a lot of sibilance Yet a big Soundstage. With some eq I like these more than my s5's. But I can understand some will find it to too much. The ZSA are really small, and I prefer the size of the s5's. The free cable was a joke, it does not fit. Its a female connector instead of a male.