Was last weeks Chicago victory the official "turning point"? The point where the Seahawks are bonafide, as good as anyone, Super Bowl contenders? I think so.
I think last week's game may be the last time we fear the Seahawks playing lessor competition, like the Bills next week. IMO, they know they can beat anyone now. Put it this way, if last week was week 1, IMO, the Hawks are a 13 win team. They wouldn't lose at Stl, Miami, Det, they'd win those.
For Holmgren's teams the turning point was the last road game of 2004, in San Francisco. Just like this version, that version couldn't beat the University of Colorado, if it was in Boulder. The Hawks won that game, and finally went into the playoffs. Then, in 2005, the Hawks proved it was the turning point, by finally beating the Rams, etc, etc.