I'm about to broard my 8th segment of the last 10 days and half have been in F. PFB has been offered every time. When I flew from DCA to ATL on Wednesday the FA took jackets. It was a 757.
When I flew SLC-DCA last week the flight leader actually came through first while we were taxing and asked each person if we were offered and served a drink of our choice.
The flights where PFB is usually missed, in my experience, are DL Connection flights.