Hand speed cannot be compared across weight divisions. You could have terrific hand speed at 175lbs and look slow against someone at 140. You have to compare apples and apples not apples and oranges. You don't have to have the fastest hands in boxing to be really good just the fastest in your weight division.
Got to disagree on Loma, he is definitely fast. Agreed though with Khan, he'll be the fastest if he hasn't lost any. Although need to see him punch someone soon to keep him in mind.. I think people get that but think the thread is literally about who is the fastest, not necessarily meaning they're better, or it benefits them more than someone else who is heavier with only slightly less speed.