How would you compare his form now to his FO SF run in 2009?
That run was in 2010, and my memory of Berdych's run was that he went for broke on second serve returns and was breaking people left and right because of it. I still don't think he would have been in the type of grinding points that he was in for the first two sets today. The ability to be behind in a point but hit the backhand deep enough to get back in isn't something I'm used to seeing from him. In 2010, I feel like an out of position Berdych would have had a "winner or bust" attitude.
The key difference there isn't when you are in-form, it's when you are out of form. Berdych was in-form in 2010, and that's why he went SF/F in back to back majors (beating 3 of the big 4). Right now, Tomas can be playing terribly and still beat bad players with a combo of big serve/forehand and weaker backhand. His worst loss in seven tournaments is to Ferrer, with all seven coming to top ten players. That's pretty crazy for a guy who was seen as volatile and inconsistent for the better part of a decade.