It wouldn't be fair for me to compare because I never was able to get a good seal with the ie80. I had to resort to comply tips to get them to seal at all, but they would usually fall out after 30 minutes or so.
I will say that the gr07 signature fits me so much better than I expected. Wonderful mids and treble. Never bright or harsh, but detailed and smooth. They bass is there when the recording calls for it. Great IEM for me!!
I'm sure you can relate, but I feel that using the GR07 (BE in my case) during the day between commuting and work, and coming home to use the HE-400, they compliment each other very well! If you enjoy one, you're bound to enjoy the other, at least that's been my experience. They're both so fun and versatile to listen to, I get drawn in and zone out easily haha!