The hexar AF is a great piece. The only downside for me was the *very* slow top shutter speed. Otherwise, wowie zowie. I really enjoyed it but had to let it go when I realized I'd be shooting at ISO 25 to take care of the speed problem.
In addition to being very quiet, the hexar AF also has very good frame tracking, good enough to switch rolls mid-stream.
I would definitely reconsider the Contax G2. Impossible to beat that deal.