comparing open-back headphone to a closed one. They are very different. The HRM-7 looks interesting. I heard some low-end Pioneer iem's and they got me interested in this brand with their impressive sound.
Still using my K323's, today compared to them to my other portable headphone, Koss Portapro. After the akg's, portapros sounded very anxieting. Muddy in comparison, less soundstage, less defined, worse transient response. They sound almost cable broken in comparison..
Try iphone 5 too, has good enough camera imo (with vsco). Windows phone is just garbage, friend has a broken 1020 that crashes by itself 2-3 times per day. I have a Lumia 520 and it has a ****ty hp output.
tip of the day: get better sound quality by wearing a beanie under the headphones guaranteed working 100%. I will write a review of this mod later on comparing different beanie types.
note: works best for EDM music.