Excerpt: I bought this lens in a kit with the 5D MkIII and have found it to be a great all-around lens. While not as fast as an f/2.8, high ISOs make up for that, although you can't get the 2.8's background blur.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Nice Bokeh, Rugged, Strong Construction
Canon EF 24-105mm f/4L IS USM Standard Zoom Lens for Canon DSLR Cameras
6 January 2016
Excerpt: Amazing and the most universal lens among all on the market. However, maximum aperture will not allow you to receive amazingly blured bokeh and it will push you to raise ISO up to 4000 sometimes.
Pros: Quality of picture and materials, easy to control, fast focusing
Cons: Sliding trunk, which makes the lens not so dust and water resistant. Pretty dark lens.
Excerpt: I have owned two other Canon L lenses--the 24-70 and 70-200 for many years. But I always thought this 24-105 mm would be the perfect walk-around lens as that extra telephoto distance would cover more situations that would prevent me from having to switch lenses. And I have been correct.
Pros: Consistent Output, Fast / accurate auto-focus, Nice Bokeh