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@Airhead
That doesn't make much sense to me, seems likely you will get more extension distortion with a 20mm lens. However it might not be that noticeable, I've not tried it.
The other issue with a wider lens is the depth of field. It's harder to create bokeh with a wide lens. So it's easier to focus but harder to isolate a subject. Your angle of view will be the same as a 40mm.