Here is something I put together for my own comparison earlier this the year after picking up a 1.4XII. Basically a comparison of image quality of my original 75-300 zoom, and then a 70-200/f2.8L, and 300/f4L, the last two also hooked up to a 1.4xII. It is a fascinating series showing the same bar-code on the back of a book. The attachments are Microsoft Word so these here may not work out. No warranty as to quality, as I said, I did this for my own benefit.
Andrew
[attachment=12317:200_mm_p...ide_open.doc][attachment=12318:200_mm_p...sons_f_8.
doc]