Kasra, thank you for writing such an excellent and useful review. This kind of lens comparison is exactly what I am looking for. Most people repeat the objective facts about the lenses - stuff that you can find on the Canon website. You have provided your subjective opinion on image quality especially bokeh and on using the lenses in practice.
Thanks also to Keith Z Leonard for sharing his excellent personal insights.
I would like to hear more personal opinions from people who have the 135mm AND the 85mm - which lens has made your best pictures?
lots of reviewers also mention that the 135mm gives more reliable results due to easier focusing, slightly more depth of field, etc. I only use one or two photos from each photo shoot, so I don't care how many bad ones I take. I make sure to take plenty of photos and bracket focus to make sure I get that special shot. So depth of field and focusing is a non issue for me. I would be just as fine with one of the stellar manual-focus Zeiss lenses if it wasn't for the price. Similarly, weather sealing, weight, etc are non issues.
i actually own the 70-200 IS I and would like to add either the 135mm or the 85mm for portraits. I feel like the 85mm would give me better results than the 135mm. Both lenses blur the background about the same, but the 85mm does not compress the background so much. It makes photos look more three dimensional, perhaps. Would you agree?