Sitting in an FIA that we have in the shop, it looks like the race seat places me about 3/4" lower than the street seat, measured at the height of my line-of-sight. I only weigh about 160 lbs, so someone heavier might be a little lower in the street seat but, because of the lack of paddling, no change in the Comp seat.
Considering the lack of padding in the Comp seat, your comfort is pretty dependent on your butt's shape and its own natural padding.
