Scratched Sensors of Brand New K-5 Units

This user reports that both his K-5 and his friend's new K-5 have a visible scratch on the sensor:-http://www.dchome.net/viewthread.php?tid=949406&extra=page%3D1(in Traditional Chinese, Google English Translation Here)It is told that the scratches appear on different positions on the sensor of his unit against his friend's, though. But the worst thing is that the scratch is visible when pictures