I reckon thats got to be some kind of reflection off something. I notice it shows horizontal in portrait and vertical in landscape so doesn't move around.
It's not a perfect circle more a parabola so it can't be lens mount or similar.
It does suggest something like a wire hanging somewhere it should'nt be.
If whatever is causing it where behind the sensor bending it you would get an out of focus area around the line and there isn't.
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it is only apparent when its something bright........... i shot about 700 shots at TKDlast week and its not in any of the, but that was all inside
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This also suggests a reflection needing extra light to show it up.
My next move would be to set the camera to sensor clean without a lens and have a realy good look round the shutter box and sensor. Does anything look out of place.
Carefully shine a light into the shutther box and look for a curved reflection on the sensor. Don't leave the light on too long in case it does the sensor a micheif.
If it's on all lenses it's definately down to the camera, and maybe a shoddy shutter box change.
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