One of the users I've discovered that nobody has mentioned is as a macro lens. There I said it. I put a Kenke 12mm extension tube on it and just wow! No need to buy the 100 or 180 macro lens as this covers all ranges. I have a 50d crop camera and a 6d full frame camera so all my lenses are very versatile. Range is 70 ff to 320 crop frame with macro as a bonus and this lens is about as much a value as you will find anywhere. I won't repeat all the effusive praise others have written except to say I concur with most of it.
After hearing all the praise for Sigma's Art line of lenses I decided to purchase the 35mm and I could not be more happy with my purchase. It is sharp wide open and the bokeh is beautiful. I'll be adding other prime lenses from their art line to my camera bag.
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