Went to my local best buy today to check out the new S6, M9 and listen to the snapdragon N4, iphone 6. Used a set of shure 535 with grey filters, had to listen to youtube to compare across android devices(iphone did not have it). They all sounded quite good and certainly on par with my wolfson N2(with voodoo). The iphone sound is probably the best but I can't handle the lock-down on ios(like a lot of custom mods). What surprised me was the SQ of the N4, clean, no hiss. The S6 and M9 are both excellent but after coming from a Note 2, I was not partial to the smaller screens. The M9 has a bit more power but not needed on iems. What was also interesting was the sprint N4 had more audio power than the verizon (sprint level was about 2 clicks down for similar perceived loudness). Looked on xda and there are ways to alter the loudness but you need to be rooted. So they are all fine devices, I think I may get over my wolfson dac snobbishness and get a N4-sprint. Other factors in favor of the N4, removable SD, battery. BTW, the N4 edge is a stunning unit but if you are into root/custom roms, they are very limited.