Am I expecting too much?

Maybe I'm pixel peeping too much, but does this look like something that should come from a 5Dmk2 at 100 iso, on a tripod?

Looks like 1600 iso or higher to me.

No pic.

That looks pretty noisy to me...

Sorry updated, it's a 100% crop.. but I think something might be wrong.

I can't see the pic either, but if you have deep shadows and try to boost them a lot, you'll see noise no matter what the ISO -- in fact you will get better results shooting with ISO 1600 than you will shooting with ISO 100 but 4 stops underexposed.

1) post the entire picture resized so we have some context
2) is this a 100% crop or greater?
3) was your picture exposed properly?
4) what were your camera settings?
5) did you sharpen the image a lot in post?

I'm seeing almost no chroma noise.

Here is the full size image.

The shot was exposed properly.
It was shot in RAW, no editing done what-so-ever.

That's too small for me to see anything -- can you crop a small portion of the image that shows the problem you are seeing, post it at a decent size, describe what you are seeing, and tell what processing you've done to it?

Here's a larger version of it. No editing has been done to it at all. These are straight from the RAW file. Lately I've been noticing a lot of weird banding and noise in very low iso shots. I feel it should be extremely clean. The top left corner is the problematic area, well actually it's all over the image you can see the noise.

HTTP response: 502 | MIME changed to 'text/html'

I think you're pixel peeping too much. 100% on a 21megapixel sensor will appear to be more noisy than the 100% on a ten megapixel sensor, when in fact it is not. Your image looks great.

what was the exposure? could be noise from a long exposure.

Hmm, I don't see anything bad here, but that's just me, and at my age I think I need reading glasses for my reading glasses -- maybe someone with sharp eyes will spot something, but if you are seeing something that looks obvious to you it may be something other than your image. Have you checked this out on other equipment? Is it possible that your monitor is adjusted in some off way or is simply too bright?

Well, you have a relatively bright foreground subject (the pig), and in order to keep that nice and unclipping (is that a word?), you'll sacrifice some of the shadows.
As our resident noise expert Gabor (Panopeeper) would say, high ISO does not cause noise, underexposure does. So if you have parts of an image that are underexposed in order to keep your main subject properly exposed, I don't think it's unusual to see some noise at 100% from a 21 MP camera.

Pixel peeping a 5DII at 100% is like looking at a 46x enlargement from 10" away.

Digital photographers are overly obsessed with 'noise'...you should see a 135 format film blown up to that magnification and see the clearly visible grain at the same magnification! We used 6-8x magnifiers on 10x enlargements when focusing enlargers in the darkroom by visualizing grain!

Wilt wrote in post #10188710
Pixel peeping a 5DII at 100% is like looking at a 46x enlargement from 10" away.

Digital photographers are overly obsessed with 'noise'...you should see a 135 format film blown up to that magnification and see the clearly visible grain at the same magnification! We used 6-8x magnifiers on 10x enlargements when focusing enlargers in the darkroom by visualizing grain!

Well, except for the fact that a 5D2 file well exposed at ISO 100 should not look noisy at 100%. And I don't myself see noise/banding in the shot. The main thing that can show up with a high res image is camera shakiness, but no more than if it was shot with a 20D/30D. If my camera was shaking enough to be blurry at a 100% view, I'd want to know about it and correct my technique. If my camera was producing noisy images when well-exposed at ISO 100 I'd want to know about it too.

But I'd agree that in the above pic it doesn't look noisy to me and I'm not sure what the OP is seeing and why.