If you have the 18-135, imho one of canon's best creations ever, you don't need the 16-35. Do not overlap! Extend your range with the 10-18...take the money you will save and buy a case of brunello when you get to tuscany. The 2009 and 2011 vintages are excellent. And when you get to the top of brunelleschi's dome you will appreciate the light weight and ability to get close
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