So what ear bud you gonna get for your sound? Which one is the king of unamp earbud

pk2, easier to drive, more comfortable, and looks cheaper (good for me )

regarding to price, pk2 and cm700 is nearly the same

+1 for the PK2. It's a great everyday earbud, with a fun presentation that's somewhat grado-like. Plus points for durability too, I've yanked the cable pretty hard a couple of times, and it still works great!

Yuin OK1, PK1, OK2, PK2, and Audio-Technica ATH-CM700 compared with pictures.

I own both the Yuin OK1 and Audio Technica CM700. When not looking at the sound, the Yuins fit in the ear much easier in the pocket of my ear and are more comfortably because of that since the CM700 earbud is so wide. When lookin at the sound, I will say the CM700 have an awesome soundstage with great mids and highs, but lack alot in the bass department. I will say also that the CM700 wires are alot better then the PKx series.

So unless you want more durable wires and a massive soundstage, I suggest getting the PK2s for the higher bass and easier comfort (since the earbud is smaller).