I would bet medium format shooters snicker at lowly FF shooters and the FF shooters resort to the same arguments APS-C shooters make. :-)
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I've used the a Yashica SLR film camera before getting a 500D then after 3 years, went for a 6D. I won't go back to APS-C again after that. The shots I get from an FF and an APS-C is too different. Aside from that, high ISO capability for an FF is too amazing compared to APS-C. For events, an FF is really a joy to have.
My advice is to skip both lenses and adapt a Nikon 14-24mm. Both Canon offerings are incredibly horrible.