<p class="MsoNormal" style="margin: 0cm 0cm 0pt;"]<span style="font-size: small;"]<span style="font-family: Calibri;"]Bes,<o></o>
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<p class="MsoNormal" style="margin: 0cm 0cm 0pt;"]<span style="font-size: small;"]<span style="font-family: Calibri;"]I read that your main objective for your wide-angle is Landscape photo so I share my criteria for choosing between the 17-40L and 16-35L.<o></o>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt;"]<span style="font-size: small;"]<span style="font-family: Calibri;"]I have a FF camera, and I have a Sigma 17-35 f2.8 -3.5, that has problems so I am considering to change it. My dilemma is between the 17-40 f 4L and 16-35 f 2.8.<o></o>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt;"]<span style="font-size: small;"]<span style="font-family: Calibri;"]The major dilemma is that it is nice to have a f2.8 lens, but like you I use the wide angle primarily for Landscapes, in this case you close down to f.8 &ndash; f.11 and more most of the time to have the right depth of field. So you lose the large part of the advantage of the 16-35. <o></o>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt;"]<span style="font-size: small;"]<span style="font-family: Calibri;"]17-40is lighter, al lot cheaper, and have a 77 diameter common to all my other Canon Llenses, so I do not need to buy and carry another set of Circular Polarizer and Neutral density, that I use often shooting landscapes.
<p class="MsoNormal" style="margin: 0cm 0cm 0pt;"]<span style="font-family: Calibri; font-size: small;"]I do not like to take a lens that is considered worse than another, so I still have the dilemma, but I think that some of the cons of 16-35 like filters and little use of f2.8 in landescapes will convince me for the 17-40.
<p class="MsoNormal" style="margin: 0cm 0cm 0pt;"]<span style="font-size: small;"]<span style="font-family: Calibri;"]Last think IS is not important in a wide angle lenses, so I do not think Canon will put IS in any lens between 14 <span style="mso-spacerun: yes;"]to 40 mm, do not wait for it.<o></o>
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<p class="MsoNormal" style="margin: 0cm 0cm 0pt;"]<span style="font-size: small;"]<span style="font-family: Calibri;"]Gian Luca<o></o>