Since I use my 70-200 2.8 IS II for portraits I never use my 100 macro for that purpose. I have owned both the 100mm macros, and ended up keeping my non-L. I didnt like the Hybrid IS system in the 100L. Sounded clunky and I didnt like how it flops around a bit inside the lens barrel when the lens is unmounted. I didnt like the build quality, IMO is was not up to L standards. As mentioned ealier, IS doesnt really help with macro photography if you use a flash, which I always do. I didnt like that I had to buy an additional $40 adapter to use the 100L with my MT-24EX flash. I didnt like that the 100L was not a standard filter size like 58mm or 77mm which ALL my other lenses match. And lastly, since the IQ for macro is very much the same, there was no gain in IQ from the 100L. Needless to say I returned the 100L and kept my non-L.