I absolutely love the Sigma 15mm... I own over 15 "L" lenses but the Siggy 15mm is one of my very faves. I bought every UWA fish available when deciding which to go with; Canon, Siggy, Samyang/Rokinon , etc... tested them all, kept the Siggy. I wanted to love the 8-15L but the Sig was soooo much sharper. Depending on what show up at the door depends how much you'll love the Samyang, out of 3 copies only one was worth looking at. Besides the Siggy still auto focuses and "works" well with the 5D3. When my son was about to be delivered, I looked at all the lenses I owned, then took the 15mm into the delivery room. Love it that much!!!!
MotoGP 2012 Mazda Raceway, Laguna Seca - Helicopter Ride by David KM, on Flickr
FurCon 2013 - San Jose, California by
00/52 Weeks of Sailor - Birth... 21:03 May 14th, 2012 by David KM, on Flickr
Monterey Bay Aquarium by David KM, on Flickr
Love the Furcon shot!
I prefer the Canon 8-15. Gives the best of both worlds.