Excerpt: This is my first telephoto and my first L lens. The main purpose of this lens is just to take pictures of my kids and landscape. All I have to say is that all the positive comments about this lens you read is true.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Nice Bokeh, Rugged, Strong Construction
Excerpt: Okay, let me start by saying I too had the 2.8 is II vs f4 is dilema.. Well first I asked myself how many times have I shot sports indoors or any other poor lighting situation (which the 2.8 would be a defntly winner)? Maybe 3, 4 times in 3 years...
Pros: Fast / accurate auto-focus, Nice Bokeh, Rugged
Excerpt: I like the lens and it takes very sharp images when there is plenty of light out. It focus fast but when I need to take evening shots is not as sharp due to the limit on F/4L. I decided to return the lens and go for the 2.8 version instead due to I'm shooting more during the evening.
Pros: Fast / accurate auto-focus, Lightweight, Strong Construction
Excerpt: This lens is a great addition to my kit. The f4 lower limit makes it harder to use indoors with available light however I use it primarily outdoors. The lens is great on my 7d. I currently have the 17-55mm EF-S lens on most of the time but for extra reach, I use the 70-200mm.
Pros: Consistent Output, Durable, Fast / accurate auto-focus, Lightweight, Nice Bokeh