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I'm wondering if anyone's seen this subtle "crosshatch" style banding on 5D2 RAW files...

EXIF:

5D2
TS-E 24/3.5L II
f/5
1/40
ISO 100
B+W 010 UV Haze Filter

By no means do I feel like I was "pushing" the camera. It was a pretty standard sunset position. This is the first I've seen this on my files, though I haven't shot much at dusk since purchasing the 5D2 a few months ago.

I could actually see the bands even more clearly on the camera LCD. Pushing the exposure up a bit in ACR reveals the pattern.

Full, Crop and Crop+3EV from different part of the image attached.