Should I sell my 17-40 f/4L for the 17-55 f/2.8 IS?

[2484Stryker]

I haven't used the 17-55mm, I just used Bryan's excelent ISO 112233 resolution chart. Here is the link if you haven't used it yet http://www.the-digital-picture.com/R...ple-Crops.aspx.

John.

Thanks for the link. It looks like 17-55 is sharper at most apertures except at f/11, which is sharper for the 17-40 at the centre. I mostly shoot at f/8 though, and it looks like 17-55 has a very slight edge in this area...