fyi: honda has a feature on their website that allows you to compare models side-by-side.
for example, clickie here
and then click the "Compare this Honda" link on the left.
the f4i is intended more as a street-cruiser version for the masses, while the RR is the formula race version. glaring differences are: suspension (forks are different, and check the sexy swingarm on the RR), riding position on the RR is much more aggressive (read: uncomfortable), undertail exhaust, i believe the fuel injection system is different, better brakes on the RR, slight weight difference.
anyone know how the horsepower compares, or the gear ratios?