"same old question" in a diff way- Has anyone NOT had a problem with sensor dust issue in the D600 .

It is a problem largely of perception and illogical to blame the camera. I would expect that the D600 has been the first full frame digital camera owned by most of its owners. Going from DX to FX sensors I was initially surprised at how much larger the sensor was and with more area the task of keeping it clean was increased proportionately. Twice the sensor area for dust to hit and be visible.

I had to change the way I cleaned camera sensors and was happy to find the Visible Dust V-swabs which make all the difference in the world for cleaning full size sensors. Their corner swabs are also excellent.