So I bumped to this problem today.
Cycles doesn’t give me any DoF on reflection. (Image below)
Is this something cycles doesn’t do automatically yet or is there some settings I need to adjust.
Attachments
If you have enabled DOF, it will be calculated correctly in Cycles when it comes to reflections.
Mind you, though, that mirrors with curved surfaces are basically lenses (“mirror lenses”: http://en.wikipedia.org/wiki/Curved_mirror) and can show distant objects in focus, while outside of the curved surface the distant objects are blurred:
