My G7 was with Canon for about 1 week. So far, I am very happy with the results. As what you mentioned, it all based on your luck as who is the technician attending to the camera.
As requested, below is the pic showing the pale white spot. It is boxed in red for easy reference.
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PS: The location and size of the spot is not fixed. Some photos shows big spots while others, like the one shown above, is quite small.
My spot looks exactly like yours, but dark, darker than the surrounding

