Hiya matey!
Its basically all down to movement. With Supreme Cleave you can take a single 5 ft. step while cleaving. With Perfect Cleave you can cleave after critting. You can still only cleave a given target once (which sounds like an idea for a new Divine/Cosmic Ability).
So you could theoretically cleave every opponent within reach of your starting posistion and any single five foot step.
Some of the divine/cosmic abilities let you take your full movement while cleaving and so forth, so you would be akin to a blur of flesh and steel on the battlefield ploughing a furrow of destruction.