Right, if you are used to how the 009 sounds (and provided the sound agrees with you) and you move over to the 007, it will most likely sound a bit lean and "lacking" in detail at first. But when you are used to the 007, the 009 just sounds fucked up in comparison IMO. As mentioned above, how we perceive and appreciate sound has much more to do with psychological factors than our actual hearing ability. If you are mentally set on the 009 being the optimum for whatever reasons - which really I can understand, as it's the most expensive offering in STAXs lineup, has been almost universally praised to the clouds and also considering that many people seem to agree better with what I'd like to call the more "modern" standard of HiFi (bright, thin) - then naturally the 007 won't sound better if you don't want it to.... or something. And vice versa.
But I'd like to think I know how an organ sounds, how a trumpet sounds, how a violin, a choir, a double bass and a female soloist sound. And I recon many 009 users do as well to some agree, which I what I keep scratching my head about. The 009 just doesn't portray those instruments accurately.
Surely you can tweak the 009 should you wish, the resolution is there and FR is easy to deal with using a good EQ. But for the price asked, things should sound more right out of the box.
Oh and about the punch, the 007 needs lots of clean power to really get that punch. Fed correctly it has bass that is as fast, extended and punchy as on the 009, but with more body and heft.