Dante used it just like he did with Rebellion, so while being skilled swordsman, you cant really say that he used the blade's full potential.
Trish made some of her own moves with the blade, but then again a lot of them are the copy of Dante's already existing moves.
Arkham hasnt displayed that many feats with it, he proved that he can swing it (Well it's something), create wind slashes capable of destroying big columns (well almost like Yamato, but weaker) and crossed the blades with Dante.... That's all. Should we count his blob form?
Sanctus did managed to use it as a floating weapon, creating energy beams out of it and even learned a few moves (something similar to stinger), but in the end all he did, was to use the blade to enchant his own powers.