If 53-43 is considered unexpectedly close, that pretty much answers this question.
considering that Perdue won by 20 points in 2006, a very good year for Democrats, I'd say that was unexpectedly close.
I think Deal will be reelected in 2014, but I have a hunch that 2018 could be competitive.
As someone said, Georgia is not nearly as solidly Republican as people think it is, and it's becoming more competitive by the day. It'll just take time for the voters to tire of the GOP and the democrats here to get their s**t together.