Lens scratches?
I wonder if they're still using the same lens cover design, which has, in certain casss, been scratching lenses since back with the G9 and has persisted through to the G12? [Google it, if you don't believe me]
Don't get me wrong. The G-series are fantastic cameras [I've got a G10 myself ] but, whilst this problem continues and Canon refuse to acknowledge it, or replace affected cameras, I won't be in any hurry to upgrade.