Absolutely love this lens. Grew up with FD zooms, and the quality of the topic lens just blows them, and me, away. As sharp as my late great 135, I swear. Can't believe this is a zoom, and color/contrast is world class. The IS is a miracle, I can shoot indoor at 1/30 all day; it's a real light vacuum to be a friggin 4 aperture. TC is no problem at all, I see no image degradation whatsoever with my Tamron 1.4 pro.
The day may come when my entire lens collection is comprised of this lens, the 85L, 17-40, and a fast 50 when Canon finally makes one that behaves properly (2.5 macro excluded, awesome lens but not very fast)
I put a lens coat on mine, makes it a little less conspicuous.
Canon knocked it out of the park with this lens, and set a pretty darn high bar.
I have the IS version and is by far my favorite lens, very sharp and quick AF. Always in my bag. Much lighter then the 2.8 which is why I went the F4 route. Plan on keeping this one for a long time.
My first L lens was the 70-200 f/4 non IS. I sold it because I wanted a longer lens (100-400). The images from the 70-200 were great - better than those from other L glass that I own. I'm sorry that I sold it. I intend to buy another someday.
