I keep coming back to this episode 227 from TWiG and in the video, Matt Cutts talked about the Hummingbird algorithm at exactly one hour and twenty minutes into the video. He spent maybe a minute or so talking about it.
Matt Cutts said that the Hummingbird algorithm actually effects 90% of all searches but he said only to a small degree. So while Panda may have impacted 10% or so and Penguin closer to 3% or so, Hummingbird impacted 90%. But Matt Cutts said only to a small degree where users should not notice.
Here is the snippet of what Matt Cutts said:
Hummingbird effects 90% of all searches but usually to a small degree because we are saying, this particular document isn't really about what the user is searching for.
I know Google has told us searchers and SEOs should not have noticed any impact to rankings and traffic based on this algorithm update. But we suspected it may have impacted some.
With such a large footprint, 90%, it had to on some degree.
Forum discussion at Google+.