Who had the Best knock out jab

Louis and Liston come to mind, obviously. Terrell had a pretty stiff jab, too.
Among the lighter weights, Willie Joyce in the 1940s was said to have a hard jab. Lou Gross trained him and touted him to the high heavens in his articles in The Knockout, etc. all through the '50s and '60s. Don't know much about the guys in the past 20 years or so.

 

Simon Brown

 

Holmes, Quartey?

 

Larry Holmes

 

1-Holmes
2-everyone else

 

Quartey's jab was a beauty.

 

Pinklon Thomas had an heavier jab than Holmes but it was a lot slower and more telegraphed as a result.

 

Liston Holmes Foreman Lennox all had fantastic jabs

 

I'm going with Holmes and throwing in Hearns as an honourable mention because his powerful flicking jab was a thing of beauty.

 

There's no comparison between Liston's and Hagler's jabs....not even in taking into consideration the weight and size difference.

 

Power jab? Sonny Liston

 

From the lighter divisions: Nedal "Skinny" Hussein. Ask Manny about that jab. Skinny had some serious flaws but he could punch

 

Frank Bruno

 

Beat me to it. The first thing I thought of when I read the question was Brown knocking Terry Norris down with a jab in their first fight.