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.

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.