Since getting the 70-200mm f/2.8L IS II last winter, this lens has been the most used lens. It's my first L and I love everything about it... except the chromatic aberration. One of the specs on the lens was that it was improved to minimize chromatic aberration. I guess 'minimize' is the key word because to me I feel like there is a good deal of chromatic fringing -equal to the amount I get from photos using the 55-250mm based off my experience.
But maybe I expected too much and maybe if I used the 55-250mm the color fringing would be even worse. At first I ignored it but lately when I edit photos, those purple fringes are really annoying. But I could be overreacting.
I'm not sure exactly how to do a 100% crop so I'm print screening what I see at 100%. This is unedited:http://img689.imageshack.us/img689/7417/cafringing1.png