10 out of 10 points and recommendedgreat IQ and build, lightweightnone!
This lens is my favorite in Canon's lineup! The optical quality, build and size/weight makes it the best choice for landscape photographers.reviewed August 28th, 2013 (purchased for $650)
I use this lens extensively and it spends most of the time mounted to my camera.
Please check out my landscape gallery http://www.tomas-stehlik.com/landscape-gallery/ where most of the pictures are taken with this lens.
10 out of 10 points and recommendedgreat IQ and build, lightweight for its categorylack of IS with those focal lengths, but you can get the IS version if this is a concern
Another great lens from Canon. I have loved this lens very much when using in tripod, unfortunately cannot use those focal lengths without IS.reviewed August 28th, 2013 (purchased for $500)