I have my trusty IIN up for sale, but I'm having sellers pre-selling remorse
, so rather than getting rid of it, it'll stay in the stable.
My assignments don't call for a "sport" body, and even if it did the 5DIII AF should be up to the task, right?
So why keep the IIN? Well...the AF is just rock solid and almost a can't miss! I also like the 1.3 crop, especially now with just full frames. Arrgh! I'm just venting/rambling. 

