There were about 3 swinging strikes for every 4 called strikes across all of MLB in 2021.
— Codify (@CodifyBaseball) December 7, 2021
Only two pitchers in recorded history (with a reasonable number of innings pitched) have racked up 2+ whiffs for each called strike:
2019 Josh Hader
2021 Liam Hendriks 🔥🔥 pic.twitter.com/P3VflxoZjC