I have always wanted the Olympus 7-14mm for my E5 but the huge price has always scared me away. Now the future of Olympus 4/3rd mount is up in the air I just couldn't risk the move. So I now have the Sigma 8-16mm. With the crop factor it is actually 2mm wider than the Oly. It is a really sharp lens but I did experience the green flare problem that I read about in reviews. Like the Oly I can't use an ND grad on it due to the front element sticking out. But I love the lens and sure I will get a lot of use out of it. I used it here on the NEX 7. My a77 is on it's way back from Texas with a new shutter dial I hope. I should have it Tuesday but the NEX 7 is the perfect back up. I am real happy with it. I am not sure I have seen a wider lens than this one.
Blue Cat, edit 2 by Cosmonaut's, on Flickr