Hi there, welcome to the forum.
I would be wary of calling anyone using a K mount lens on a full frame Canon DSLR a friend. You can mount the lens with a cheap adapter. There is a dark secret, however. The aperture lever gets in the way of the mirror. Canon owners cut/grind/snap off the lever to prevent damage to their precious bodies. You could cut a notch in the mirror, but nobody does that. The diaphragm of such a lens will never work properly on a Pentax body again. There is no easy way to undo the mod either.