What about the 16mm on the Contax G series? Flicker streams seem to be pretty normal looking.
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That lens is somewhat anomalous in that it is a highly corrected, specialized lens. Were it not on a rangefinder, it could not exist. It is remarkably free of pincushion and barrel distortions, but if you put something at the edge of its field of view, it will distort it from a perspective point of view. No way around it. But compared to a fisheye, or even a superwide zoom for SLR, it is distorionless. I wish I had the Contax G-series catalog still that showed images from the 16mm - there were some good illustrations of its effect. Now, center a subject in the frame and position it at medium distance and it will look quite normal.