Headfi user, hans030390's review of the Oppo PM-3 is the best review I've seen of the headphone. Neither my review, nor John Darko's review-and-factory-tour, is even close. Reviews of this calibre hitting headfi in the last few days are true triumphs of our community.
Hans030390's review is as richly illustrated with subjective listening impressions as it is with objective measurements. Bravo.
Especially interesting to me is the fact that Hans uses an in-ear microphone rather than a dummy head or other simulative measurement device.
Read the entire review, it's worth it: OPPO PM-3 - Great Closed, On-The-Go Planar