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If you look further down in this forum you'll see plenty of topics on this. Their is a 7-14mm Panasonic lens which covers the wide end and has little distortion. If you want fish eye, then an 8mm Olympus ZD or 8mm Peleng are pretty fishy.
The kit lens does pretty well @ 14mm.
Ok? 28mm is pretty wide. What are you shooting?
It might not be "widespread" but some fantastic cinematography has been done with ultra wide angle optics...