Does oval-shaped bokeh indicates that the aspect ratio of the image was modified? In Mission Impossible III, I notice very often that bokeh is not circular, but has a shape of an oval. For example, here are two images where such bokeh is noticeable:





Does it necessarily mean that he was filmed using chroma key and the background was filmed separately and then resized using a different aspect ratio, or this is specific to the lens (maybe anamorphic lenses)? Is this made on purpose, or is just a side effect?
This is likely the result of using an anamorphic lens: http://www.red.com/learn/red-101/anamorphic-lenses

From the page:

Standard Bokeh



Anamorphic Bokeh