it's same with mine...i just bought new 60D 18-55kit a week ago.
never used before in outdoor, and yesterday i tried this camera in the morning in out door, and wonder why my cam's viewfinder in all surface has tiny dot with evenly pattern.
i don't think so it's dust, because just like grid, but very smooth. it is very clear to see when i aim the camera to the white object/sky. i compared with other canon camera (7D or 550D), the different is so clear.

