rear punch study

Im looking to see in your opinions who had the BEST right hand (left if southpaw) punch? Not in terms of power but technically. ie set ups or the best lead, delivery on the punch, technique, exits after, speed, etc etc.........

The obvious is mayweather who is known for a great lead right hand but who else? Any specific fights in which you recall of someone controlling the action with their rear hand?

Roy Jones. Hes not neccessarily known for it because of everything else he could do but he had a nice lead right.

I might be wrong but it seems like Khan has a nice lead right tho its nothing he controls fights with.

It seems like Hearns had a nice lead right, once again could be wrong and it wouldnt be anything he controlled fights with.

Ali had a nice lead right.