I give in to the temptation and I am IMPRESSED and has no regret so far. The cable in my PFE is now stiffening more with less frequent to zero use. :-)
PK1 has a much bigger sound. I can't believe it's coming from an earbud...really. You will feel the emotion and the atmosphere coming from the music. The PFE excels in vocal clarity, details and refinement of tones but the PK1 is way much musical and fun to listen to. Plus the bass is very big. And the soundstage, airyness, openness and any other terms for it, is just excellent. Amped with T4 and E5 (daisy-chained) driving my Fuze plus LOD from Clieos which I am currently reviewing, the PK1 is a beast to behold. And the fact that it is an earbud, the comfort and ease of use is just perfect for me. Hope the cable will not stiffen in the future like the PFE.
I guess this will be my music partner for now and hope it will serve me for a long time.
Maybe a better amp will do more justice to how this little beast sounds but for now I can live with what I have.