The mirrorless offers from other manufacturers opens up the field for some photographers. While I have never seen a Leica at an NFL game or a MLB game I imagine there are a lot of retail shops in LaJolla that sell their products. When all is said and done the mirrorless don't offer much compared to a dslr for still shots. It's more a gimmick at this point. But I have seen the best results with the EM-5 and I attribute that to the photographer. If u go Canon u want to be able to buy lightweight lenses. Of course u can use your already owned but lightweight black is the idea for being unobtrusive. The RX1 is something only Sony could dream up and find someone to buy. U can get a D800 for the price. The 4/3's offer the largest number of legacy lenses from assorted sources, but when u start adding it up you're back up to a FF if u go picking among the possibilities. However, for hand held lightweight travel w/o the use for a big tele I think they hit the spot. Right now the 5D3 is by far the best out of the box camera offered which almost anyone can use to get good results.