im 1 for 1 faster then dks mounted, not by much but faster. tested in bgs. i think its some nonsense like 20% and 25% because it takes a distance to really see the difference. only fellow pallys keep pace.
remember blizz does a lot of crap under the hood.
side note CAN WE GET COMBAT MOUNTS ALREADY, PLEASE, ID LIKE TO MOVE FASTER THEN AN ASTHMATIC ARTHRITIC GRANDMA ON MY GLORIOUS VANGUARD CRUSADER PALADIN