This is interesting, Webmasterbrain which is a SEO company has created a little experiment app. You search for something and it shows the first 3 results from the three major search engines google, yahoo and msn. You don't know which search engine gave which 3 results but for each 3 results you select which set was "Most relevant". When you've done that you see which search engine found those results.
I tried it a for a couple of search terms and apparently I chose the google results all times except one. I guess that means that my findings coincide with their results