This video shows you how to take your own bokeh sample and use it as part of your depth of field blurring.

This allows you to be even more creative with the bokeh as well as match real world lens.

All you need to do is to lift a small lens bokeh sample from an image or even paint your own one and this works very well with Physical Defocus.

One final note is that you can only customise your bokeh with the Physical Defocus Matchbox node and not using Action or Image.