I was pretty fond of my Sigma 12-24mm EF super duper wide angle lens. 12mm rectilinear on a full frame body is craaazzzyy. Unfortunately it was stolen and the replacement lens wasn't really up to scratch.
Canon's 50mm f2.5 macro is a more obscure but definitely underrated lens... super sharp...
My last purchase was the 70-200mm f4 L IS. I chose that over the f2.8 because of the reduction in bulk/weight, and the highly rated optics of the newer design.
Next thing I want to play with is a Sigma 8mm 180 degree fisheye, mmmmm
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