IMO:
ST has been great for both teams.
On offense the Hawks have been struggling with the pass, but on defense the 9ers have been struggling with pass defense and pass rush (until the second half this week, but I'm still not convinced). Likewise, Lynch looked great this week, but the 9ers are still great on run D, although Lynch is precisely the type of strong back they struggle against.
On defense the 9ers pass game has gotten going again, but the Hawks have the best pass D in the league. The 9ers run game has been struggling for awhile, but the Hawks run D looked pretty porous this week.
Basically, as far as recent trends go, save for good ST on both sides it really looks fairly even to me, and most likely to be a low scoring affair.
HFA is big in this one. If I had to guess, I'd say the deciding factors will be HFA and Lynch, assuming Russell doesn't get back into his earlier form. If he does that, TBH, I don't think it will be that close.