Chances of a fast wide prime?

Wider and faster? Probably not. Wider or faster on the other hand there is a fair selection of 24 f1.4 lenses, or even 28 f1.8 lenses (not quite as wide but faster, which is what I'll be getting).

I also however want a wide fast lens from the point of view of control over DoF, in which an equal aperture FF lens clearly has the upper hand.