Hello Tom.
I have a G3 and would like to exchange for a G4 just because of the camera. Today I went into a store and experienced the G4 and realized the lack of magic focus and I was negatively surprised. As you rightly said, the grand opening of the camera's G4 automatically blurs the plane where the focus is not done, but the magic focus has a very important feature for a camera with such a small focus, which is the option of leaving the whole picture focused. Since you can not take a picture with various focus on plans with the opening f1.8 this camera, the feature magical focus is indispensable.