Some Traditional japanese arts has kenjutsu as part of their training.
Example in one art they start with bokken to train basics of swords, then they train with Iaito (not sharp training sword, maybe like the one your friend has) and later they move to sharp katanas.
Then again other traditional arts trains mostly with wooden weapons.
In aikido there are few pair drills (?practises) and few katas. Of course this depends about teacher.
Iaido is art of concerned with drawing the blade and cutting in the same motion.
And ofcourse legends says that Musashi used bokkens because he was so good that he didnt need real katanas.