Low light lens

In very low light with the panasonic/leica 25mm/f1.4 (on the E M-5) the autofocus as well as the manual focus are a little of a problem (at least for me).

Maybe in very low light you need a real manual focus lens.

Unfortunately the only manual focus 25mm lens I know of, the Voiglander 25/0.95, costs twice (and I read that its IQ, while is not bad, is anyway not as good as the panasonic 25/1.4).

Does anybody know of another fast manual-focus lens?