Music Alchemist
Pokémon trainer of headphones
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Different manufactures measure efficiency differently. The efficiency/sensitivity from different companies are therefore not directly comparable.
LCD-4 need 482mVrms to reach 90dBspl
Abyss, need 320mVrms and 2.14mW to achieve 90dBspl
http://www.innerfidelity.com/content/technologically-impressive-lcd-4-planar-magnetic-headphone-measurements#4espkOLEI8pI2TCh.97
http://www.innerfidelity.com/content/jps-labs-abyss-ab-1266-planar-magnetic-headphones-measurements#gGzKxKyZvuVZTAWs.97
Both manufacturers list the sensitivity in dB/mW on their websites. (Whereas Sennheiser usually lists it in dB/V.) As far as I can tell, dB/mW means dB/mW.
Going from the manufacturer's own specs, I get these numbers:
Abyss
Audeze

Audeze

Tyll does not disclose where or how he got the numbers for the Audeze, but I'm just showing what the math shows.