....haven't had much of a chance to test it out, but I like its appearance and build...it seems tough! The dis-engaged MF ring is kind of a cool feature too. Is it very beneficial in improving the AF speed when dis-engaged?
Maybe if I get home in time to have some daylight to use, I can post some test shots...of course, I'm a teacher...what am I talking about. I don't ever see daylight during the week! 
Are there any specific issues with this lens that I should be aware of/take time to test out? Flaring in certain conditions? Distortion top/bottom or side/side? Ultra-Wide angles are new to me.
thanks,
daniel



