I understand handspeed is great thing to have, but look at this
1. Andre Berto: great handspeed, but he gets hit a lot.
2. Yuriorkis Gamboa: great handspeed, he gets hit a lot
3. Mosley: great handspeed, gets hit a lot
4. Meldrick Taylor: ""
5. Ray Robinson: ""
6. 70's Ali: ""
and the list go's on.

Handspeed, reflexes, even footspeed don't matter defensively if you don't use them. Prime Roy is one guy who got away with it because he amazing power, amazing speed, and he did move more in his prime. Floyd is just a really technically great defensive fighter who used technique along with physical attributes to make himself difficult to hit.

Guys should be looking at young Whitaker, Willie Pep, Hopkins, Oscar in a few fights, a guy I have been mentioning GUillermo Rigondeaux for guys who move, counter, can stop on a dime, etc. Mayweather might have a lower % of being hit, but guys can throw more punches against him because he is there to be hit, and even though he isn't getting hit solidly its still worse than not getting hit at all.