As the A7 drops in price, I have been considering selling off my APSC e-mount lenses and Nex 5R to move to full frame. I mostly shoot with adapted Rokkors these days, and I do own a speed booster. I am wondering if there is actually much to be gained in low light? The A7 is full frame, but all other things being equal would have to with ISO 1 stop higher than the 5R with a speed booster. Is the A7 that much better in low light? What have been people’s experience in swapping?