I decided to make a comparison of the equalization necessary to make each headphone sound as flat as possible to what I consider reference. This is not really scientific, but based on my years of recording music using studio monitor speakers and having heard a wide range of different speakers of all qualities and arrangements, it should serve to give you an idea of how far each set would need to be adjusted based on my ears. For the record, I had a hearing test this year, and passed as one of the best results he had seen.
woohoo!
I've used a song that I know well and consider one of the best recordings for overall sound quality, realistic instrument frequencies, etc. These adjustments would essentially make each pair almost identical in sound, although there are some properties that I simply couldn't remove from each set. For instance, the sibilance in the gr07 wasn't affected enough by eq. I literally could drop a band as far as it went down in db and adjust the width and sweep the whole spectrum. Although improved, it would never really eliminate it. Also, for the ba200, no matter how much or what frequency of highs I adjusted, I couldn't introduce the same quality of 'air' to the set as would be found in the others, but it was still improved. I'm assuming this is simply a limit of each driver's capability to reproduce these properties...
I threw in my old ex85lp and the earpods just for fun. I was surprised that the ex85lp sounded so good after adjustment. Instrument separation and overall quality was very good. I would honestly choose the eq'd ex85 over the gr07 because of the sibilance. The ex85 had very good bass once tamed down. I was also surprised at how much adjustment was needed for the earpods. I knew they had some boost in mid-bass and treble, but they ended up being the most adjusted of the bunch.
With these adjustments I would put the pfe on top as none of the others could reproduce the high end the same, but the pfe did fairly well reproducing the low end. Sorry for some of the highlighted stuff in the images.
UPDATE: I've added my new sony xba-3, and in general the pfe has a competitor now. Notice that the sony has a few points of adjustment, but all are very small...
Apple EarPods:
TDK BA200:
Sony EX85LP:
Phonak Audeo PFE 112:
Vsonic GR07:
Sony XBA-3: