One only needs to "G12" and googling "scratches" and already you get 20,000 hits.
Background: device a grain of sand in the shutter blade area, so it may lack sufficient space between the front lens and shutter
scratches come in the front lens when closing the slats.
The scratches can be seen especially during macro shooting (just for this I had my camera unfortunately bought).
Conclusion: an absolute dream camera that delivers vibrant photos. However, high risk of total loss for macro shots
by scratching the front lens. Canon evaluates the scratches do not as a result of a design flaw, but as
self-inflicted -> Repair you have to pay yourself. This, however, is so expensive that you can buy a new camera the same.