Yeah, if you are going to spend the money. Then yes. I agree.
But that lens is only for the Crop sensors. Both on Canon and Nikon sides.
If you have a full frame camera, the 16mm or 17mm lenses are more than wide enough.
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R.I.P - FELLOW FF MEMBER, IZZY, BLK2k3GTS, will always be remembered. We will compete on a different course again one day.