Went to MS Color yesterday, too bad I didn't bring the box, so couldn't change the camera yesterday. But I managed to try the display set. Compare to my set, the F11 display set shows no banding problem. Looks like I really got a 'lemon' here.
Will go to MS color again to change my set today. Hopefully as a shop serving professional customer, they would allow me to change it.
Here are crops from the photo I took yesterday at MS Color:
Display Set:
My F11:
Look at the red color of the packaging, and the pouches grey color.
Display Set:
My F11:
Look at the pouches grey color and the border to the black color, also the blue background.
Will go to MS color again to change my set today. Hopefully as a shop serving professional customer, they would allow me to change it.
Here are crops from the photo I took yesterday at MS Color:
Display Set:

My F11:

Look at the red color of the packaging, and the pouches grey color.
Display Set:

My F11:

Look at the pouches grey color and the border to the black color, also the blue background.