That was definitely my impression from CanJam. The TTVJ FET-A was my favorite pairing with the HF-2. That would make a very nice rig.
Having had it at home for a while it sounds better, much better in fact, out of the AA HPA v.1.0 than it does out of the GSX. Earlier in the year when I was able to compare the AA and the FET-A I was struck by how similar they sounded with my MS-Pro so that is not a real surprise.