I exspect to buy the 5D2 as soon as it becomes available, but am still in doubt about the lens. I am looking for good performance and light weight, don't need IS, no large aperture nor top performance at full aperture, on the contrary, I would prefer the best performance at the smallest possible aperture (I'm shooting landscape exclusively).
The Canon 28-135 has just the right zoom range, weighs less and has 1/2 the price of the 24-105. It is supported by DxO (for the 5D1). Dare I buy it, based on the exspectation that DxO will turn a maybe mediocre lens into a good one? Even Zeiss follows the line of combining compromises in lens design with software corrections...
I am also scared of Canons quality control, there have been so many reports of inconsistent quality of the 24-105 (and other lenses). My dealer claims that this problem was limited to the first specimen (of the 24-105) and is now solved, but I don't believe him.
The Leica Vario Elmarit 28-90 is toooo expensive...
Thanks for your comments.