Thank you Gorbas! Quite helpful.

According to Lomography's page, Perfekt is newer than S3 Pro...

Other than the angle of view issue both vertical and horizontal, do images taken by these cameras (Xpan and swing lens) differ in any way? Do the images get compressed/distorted differently? I'm tying to get a grip on the image differences, still. I ask this because I could, conceivably get an ultra-wide lens for my Nikon and crop top and bottom.

No, I don't think S3 is ugly at all.... I think it's neat looking!