Who autofocus needs: Stay away. See Youtube. 2-5 seconds to focus. Forget it! -> LA-EA2 Buy, the NEN levels and needs to focus only 0.x seconds.
Why the 2er: autofocus works quickly NEN AF motor has - so it can with all AF lenses. Why the 1 Series: Lighter and smaller than the 2er. Cheaper. No mirror -> 1/3 stop more light. Perfect for MF.