Found this comparison:
Sennheiser IE 80 (Bass Screw fully closed):
The Sennheiser has got the fuller, warmer sound with more root quantity. The Pinnacle P1 has got the better sub-bass extension when the Sennheiser’s screw is closed (opening the screw, the sub-bass extends linearly but the Sennheiser’s bass becomes even muddier and softer with fast music). In the mids, both are about comparably slightly warm. In the treble, the IE 80 is more relaxed overall.
When it comes to detail retrieval, the MEE is ahead, rendering fine detailed with more authority. Especially with more complex and faster music, the Sennheiser collapses to some extent whereas the MEE remains very solid.
In the lows, the Sennheiser is quite slow, spongy and muddy in comparison and lacks some control and aridness with fast bass punches. The Pinnacle P1 has got the much quicker, better controlled bass.
The IE 80’s soundstage is somewhat wider and also deeper and definitely belongs to the most spacious around. The MEE’s is not as large but separates instruments sharper (especially audible with orchestral music where the P1 is better at generating air around and between instruments).
from this review:
http://www.head-fi.org/products/mee-audio-pinnacle-p1-high-fidelity-audiophile-in-ear-headphones-with-detachable-cables/reviews/16389