I'm a bit like Birgir, while I can enjoy some flawed phones (like the PS-1 for instance) I can't stand a few precise flaws, one of them being noticeable peaks of response on certain treble areas. Unfortunately there are a few more Knowing if the 009 are going to have those flaws or not before spending their price is something useful IMHO.
Arnaud, I got the 007 mk1, but I have no top notch amp for them (some day eventually), just a decent one, the 717. I think this combo can be improved in a few areas with a better amp, but I believe they are more related to sound dynamics than to sound timbre.
Each one of us has his own set of needs and preferences. Some people can tolerate a lot of different "flavors" and being happy with most of them. Others have a more limited capability of abstraction into the music and need their set of "minimum well done things" properly resolved. "Extra resolution" at the expense of treble peaks isn't one of the things I think the 007 need to improve. However it's possible the 009 offer so many other good things that the-yet-to-be-assessed peak won't spoil the joy. We'll see, I still have to see measurements which are really to trust, and a pair of "approved ears" which have listened to them