If you're looking for a clean, wide-angle lens with very low distortion, this lens is for you. It's only compatible with Michael Four Thirds cameras, but I can tell you about the optics of this lens. are very rich and give you a very clean and crisp image and I have to tell you that I have an 18-35mm sigma lens which is the sharpest lens I have ever had and this lens is exactly the same sharp and so clean which says a lot about the build quality and optical qualities. I highly recommend this lens if you are looking for an amazing wide angle. The price is a bit high for this small lens, but overall it's worth it.
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