Reddit mentions of Neewer Black Metal Quick Release L-Plate Bracket Hand Grip for Sony Alpha A7II，A7RII，Fits Arca-Swiss Standard

I initially thought the same thing, that the A7 was too small for my hands. However, I purchased an L bracket (http://www.amazon.com/gp/product/B00K1W0KJ8?keywords=A7%20l%20bracket&qid=1453505134&ref_=sr_1_1&sr=8-1) that attaches to the camera and I seriously couldn't be happier. The L bracket adds an additional 3 tripod mounting screw holes, gets the length just long enough for me to get my pinky on it, and doesn't add much weight. I love using my camera now.

This is the one that I use. It helps because the body (pretty much all current mirrorless bodies actually) is vertically too short and the l-bracket adds just enough height to make it much more comfortable to hold.

The one you linked says it works with A7R. Lots of people complained before regarding the not so durable original mount, maybe the Tough E-mount is the answer. I just learned something cool this week about linking url's. Insert the word to be highlighted in [ bracket then insert the actual url in ( parenthesis. Like this!!! :)