No.
All races run at the same basic speed.
Factors that affect your running speed:
Lag - both client and serversideRun Speed AARun Speed buffs Encumberance I'm sure someone will chip in if I missed any
The first is the most likely culprit. Small differences which might not be apparent in normal activities become evident when following someone. I have a better graphic card than my wife (that is to say my computer has a better one than hers). She
always has to ask me to stop and wait when she is following. This happens regardless of the races involved and even if they are the same race.
A computer with really bad lag can reduce you to a snails pace even though you have SoW.
Background activity can influence this. I was on my way with friends to do something a couple of night back when suddenly I could barely move - No other applications running in foreground. I was forced to log out to clear it and what was waiting for me "Norton has updated your virus definitions". My fault for letting it update automatically.