Here you are the screenshot comparison link:
http://screenshotcomparison.com/comparison/66386/
as for the test clip, as I began to encode the final video, I'm not sure if I'm going to produce a test clip, the encode will do its job perfectly, so I prefer to finish to encode before. At least, with the screenshot comparison you have 8 different frames to compare; even if the color corrected one isn't perfect, as I wrote also in my previous post, it's better IMHO of the HD-DVD color grading...