We thoroughly enjoyed the Zeiss Touit 12mm f/2.8 Distagon on a recent trip. We spent a few days in Cape May, NJ with the Touit 12mm glued onto the NEX-7.
We are still learning this ultra wide angle lens, at 18mm efov on the NEX, most everything will be in frame. We are somewhat addicted to the NEX-7's level feature which helps minimize converging vertical lines with such a wide lens. We also depended on the NEX-7's autofocus mode while using focus-recompose to frame. Here are a few shots from the trip. They are all RAW converted shots.