The image sensor size is irrelevant. What is important is getting a lens on the camera with sufficient focal length to minimize distortion. Minimum is a "normal" lens for the sensor size. i.e. 80mm on 70mm square, 50mm on 35mm, etc. Personally I like to have closer to 85mm for 35mm sensor size even for full length but that is about minimum for head and shoulders.
For the photography newbies - it's the distances between the camera (or your eyes) and the various elements of the scene that affect perspective (the "distortion" referred to in the quote) and not focal length, per se. While using a longer focal length generally induces a photographer to back up from a subject, it's the distance and not the focal length that changes perspective.
Please read our "sticky" (found in the General Photography Talk forum) tutorial titled Perspective Control in Images - Focal Length or Distance?.
The larger problem is getting the lights positioned high enough to cast pleasing shadows. And getting the lights around to the side enough to create shape etc. Doing white backgrounds will be even more difficult.
I agree with this totally.