100L on my 1dm3 will be 130MM though but then i only get 2.8 with the IS . 135L won't it be suck without the IS ? How about portraits shots with 100L ? will it be usable ,or 135L much better cuz the F2 ?
I think i read somewhere that because the f/2.0 rating's relation to the focal length of the lens, that the f/2.0 of the 135L gives amazing bokeh because the actual width of the aperture has to be so wide.