Summary: My bag is already above 10kg. Will I add 750 more grammes to gain one stop less ? The former 70-200 has to be closed to F/4 to match it at the same aperture. May be the new 2.8 L II IS said excellent since 2.8...
Conclusion: I have wanted this lens for quite sometime but I will admit, the price was what was keeping me from making the purchase. After much thought and prayer I ordered it. What a great lens. Pictures are excellent. It's everything every review says it is. This is my first "L" series lens. It has been my main lens since I purchased it. I mainly photograph exterior landscape pictures and I am amazed at the quality of the pictures this lens produces.
Pros: Fast auto-focus, Superior build quality, Super-sharp images
Excerpt: I did my homework before buying this product. It has met all my expectations. Canon "L" lenses are the best in my mind. My only dislike is the cost being very high. In some cases, I think Canon should include more of the basic accessories.
Pros: Durable, Easily Interchangeable, Sharp Focus, Strong Construction
Summary: PROS: In short, a STATE-OF-THE-ART-LENS: - Space age 4-STOP! IS - Tack-SHARP edge to edge at any aperture - WEATHER SEALED - Fast - Spectacular Bokeh - Statistically, the best IQ out of the four 70-200mm lenses (although not by much unless compared w/ the f/2.8 IS) - Light (for those who care about that) CONS: - The Hood - relatively minor gripe, but uh, that thing is ugly!
Summary: this zoom lens from canon is regarded as one of the best in their offering and it is indeed justified. It focuses very fast and is amazingly light and compact compared to other quality zooms. this lens has Inner zoom and internal focusing which means it won't change its size when you are zooming in and out or focusing on near/far objects. Weather seals are nice and gives you peace of mind when the conditions gets a bit rough.