A headphone is a headphone is a headphone, yet comparing an open headphone to a closed headphone, a bright headphone to a dark one, a bass heavy headphone to an analytical headphone helps no one, as we all have specific preferences. True comparisons are those that stack two headphones with a closer sound signature, not a significant gap like something like the HD800 and PM-1 which FWIH are nothing alike. You are bound to lean heavily towards one over the other based on your preference. The person who compared the two was already biased towards the HD800's signature to begin with, so of course the PM-1 isn't going to stack up.
I, for one would take an LCD2's sound signature over one like the HD800 99.9% of the time, because I prefer a more intimate, mid rich, euphonic sound signature, not one that aims for detail retrieval and analyzing.
There are two main sides to comparisons (maybe others):
- Signature comparison... Compares the signature of two headphones. Allows users to be able to extrapolate the signature (not quality) in contrast to another headphone they may have already heard to know if they'll even be interested in the headphone. The Oppo has been stated to be warm over neutral.
- Technical ability comparison... Compares the technical ability of two headphones (contest-wise). This can only be done objectively if there is no bias to signature... If they share the same signature, then the bias is minimized, but still there. If two headphones have the same exact signature, they might as well be the same (I DON'T mean they are both warm => same signature...)
That's how I've always seen headphone comparisons anyways.