[antmar]

First picture gives the answer, as you can see in the lens your shutter blades are sticky and the shutter is not fully open, this gives a strange tornado like shape to any out of focus light (it is actually the shape of your shutter).
The problem is less obvious with smaller apertures and it could be disappeared at f:8 or f:11.
And yes it does affect exposure.
Unfortunately you have to have your lens CLA'd.