cgipson1
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The FoV on a 50mm will be closer to 85mm. It will still will be a 50mm lens, and perform like one. The 28mm you speak of will have a narrower FoV, close to a 50mm on a full frame, but it will have the distortion associated with the 28mm focal length. Not ideal for portraiture, as a matter of fact, it wouldn't be great at all.
I think you are incorrect. As I understand, the distortion is inherent to the camera-to-subject distance, not the focal length of the lens.
Normally for a standard portrait... you would have to be much closer to the subject with a 28mm... and that would cause distortion. If you are at the same distance you would be with a 50.. obviously your subject will be much smaller in the frame. I believe that is what Tyler was pointing out.
Wide angles / UWA's are more prone to distortion than a telephoto for instance, because of the way light travels into the lens from the sides. Otherwise a fisheye (which is just an extreme wide angle) would not produce the effect it does. A telephoto sees light in a much smaller view.. and doesn't have to attempt to "bend" the light as much as a wide angle does (this is what gives distortion), just to get it on the sensor. (Difficult to explain simply.. lol!)