What is the visual difference between Full Frame, APS-C and Micro Four Thirds pictures?

Possible Duplicate:
When do the differences between APS-C and full frame sensors matter, and why?

I am interested in a visual comparison of same scene but with different sensor technologies: One scene with bokeh, landscape, etc.

I found the following link: http://www.four-thirds.org/en/microftmerit/merit2.html

But I am a bit suspicious of the four-thirds omitting some of the more "juicy" details/errors/etc.

Since I have seen many people mentioning the loss of image quality when going to a smaller sensor, for example Micro Four Thirds.

Explanation of the scenes, on what to look for since I am a beginner, is appreciated too.

Something along the lines of what Nikon has: http://imaging.nikon.com/lineup/lens/simulator/

thanks in advance :)

PS. New around here but gonna say it anyway: Let's be civil and not start a flame war. I am just interested purely on the grounds of comparison for future purchases.

Answer

The same lens and settings on a full frame will be sharper as you can see in lens comparisons:

http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=115&Camera=736&Sample=0&FLI=0&API=3&LensComp=115&CameraComp=9&SampleComp=0&FLIComp=0&APIComp=2

You can play around with lenses, settings and cameras on that page and you will notice that FF is (almost) always sharper, despite that the corner is further away from the center than the aps-c shots.

4:3 cameras are slightly smaller than aps-c but they apparently removed the low pass filter making them sharper than aps-c, more similar to fullframe, but full frame still has the noise/DR advantage:

http://admiringlight.com/blog/micro-43-vs-a-full-frame-legend/

Note that in this test the full frame lens (sigma 50mm) is stopped down past the diffraction limit , so it is not rendering as much details as the camera could with a better lens / setting.

Compare lens/setting here for sharpness comparison (mrk III as they dont have mark II for the sigma):

http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=473&Camera=453&Sample=0&FLI=0&API=8&LensComp=115&CameraComp=453&SampleComp=0&FLIComp=0&APIComp=6

Finally there is the FOV and bokeh differences as illustrated here:

When do the differences between APS-C and full frame sensors matter, and why?

The compression/relative magnification factor is another advantage of full frame. To take good pictures of people you need a real 50-135mm (e.g. primes 50mm, 85mm, or 135mm) lens, not a "focal converted 50mm" 28-35mm lens on apsc or 4:3 camera. On the crop sensors even the 50mm lens comes across a bit narrow in your living room, so people tend to go for 28 or 35mm primes on crop sensors, which does give a fov like close to 50mm, but it warps the faces.