Google launched Penguin 4.0 in late September, but it took a while to roll out and see recoveries.
Here is a cool screen shot from Aleyda Solis of a client recovery for her:
Which Gary Illyes proclaims in response to that tweet:
He said this before, calling Penguin 4.0 their nicest launch.
I am sure many of you have similar charts.
Forum discussion at Twitter.