Those sony's have an iffy reputation and I didn't like the sound of mine at all. Boomy bass, shrill top end and no mids to speak of. CX300 are significantly better in my opinion but still not perfect. The bass is a bit inconsistent and the wire is barely long enough to reach your trouser pocket if that's where you put your MP3 player.
KSC-75s are great if you fancy something different, but they're not earphones.