Pacquiao has slightly quicker hands especially when he throws in combinations but Mayweather's timing and accuracy is better.

Marquez wasn't faster than Pacquiao but his superior accuracy and timing caused Pacquiao hell and made Pacquiao's superior handspeed sort of irrevelant.

I see it being the same with Floyd but with Floyd being faster, bigger and better defensively than Marquez, i see Pacquiao having even more trouble.