I got tired of handling my 70-200 2.8 IS when shooting portraits during rather long sessions or when I had a lot of people to photograph, it also was huge an overly obvious when out shooting in public, I now do those things on a MKIII with an 85L which although heavy, is short and balances with the camera quite beautifully.
But there are times I want to go longer and have been planning to get the 70-300 IS L that's just coming out, but I had thought it would be out by now and there doesn't seem to be any information coming from Canon. Where it would work if the image is good enough is that it's a constant f4 from 70mm through 134mm and much lighter than the bigger zoom, with new IS.
Then I got to wondering about giving in and getting the 70-200 2.8 IS MKII just because it appears that the image quality is so excellent and also has general build and stabilizer improvements, but then I'm adding the weight again.
So my third option and it's been around a while, is the little 70-200 IS f4 and I'm wondering how it compares image wise and bokeh wise to the 70-200 f2.8 MKII when shot at an f4? The area of the lens that I would be most interested in is 85mm through 135mm.
I'm not that concerned about sharpness, I know all three will be excellent and fit my needs, I'm more concerned about the "look" for portraiture, there is so much more to clarity and the way a lens handles skin than sharpness.
I would be totally thrilled if Canon made a portrait zoom that was 70mm to 135mm f2.8 IS with the new optics, made especially for portraits with the kind of rendition that you can get out of an 85L or 70-200 2.8 IS MKII.