I guess I'm more for the sound than the numbers. :) Was just a thought since the phone in question needs to be cranked up a bit more with the 27 Ohm Cresyns than with a 16 Ohm pair. Their sensitivity is in the 96dB range, I think, so that might be part of that experience.
Anyway, thanks for the input, everyone. I'm sure I'll pop back in here in the future even if I don't have time to hang around too much at the moment – and following your discussions too closely might lead to a habit that doesn't go too well with my current "starving artist" situation... ;)