I liked this topic so much, I took my 5D3 out for a little nude photoshoot with my old Sigma 50mm and here is what I shot:

I know you can't tell for sure, but I swear the horse wasn't wearing anything!
BTW, that was at F/1.4, ISO 100, 1/400. The Sigma/5D3 combo does not give the most precise autofocus, but it is quite usable, especially in good light.