I don't have a milky way sample but just generally speaking both my 16-35's (mk1 & mk2) are pretty soft and lack colour and vignette a bit when shot wide.
The sharpness thing is probably pixel peeping yeah - especially at web sizes. When you downsize the image to email/web/flickr sort of sizing it'll be ok, especially after a light unsharp mask.
It probably distorts quite a bit at 16mm as well. I'll have a mount here mid next week so I can try then and send you a full rez file if you aren't in a huge hurry.
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