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Here are some test shots of the new Tamron 11-18. As I have said they do seem to more consistent across the frame than the Sigma 10-20 that I had, but there does seem be a little more CA.
Note that while the lens does focus internally, the focus ring does move when using auto focus. The focus motor is noiser than the Sigma, but I did not find that to be a problem.
Note that the pics not shown as small are about 1MB. For the dialup users, the ones shown as small are about 300Kb.

Regards
Meicw

http://www.users.tpg.com.au/~meicw/Tamron_11mm_f4.jpg

http://www.users.tpg.com.au/~meicw/Tamron_11mm_f4_small.jpg

http://www.users.tpg.com.au/~meicw/Tamron_11mm_f8.jpg

http://www.users.tpg.com.au/~meicw/Tamron_11mm_f8_small.jpg

http://www.users.tpg.com.au/~meicw/Tamron_14mm_f5.jpg

http://www.users.tpg.com.au/~meicw/Tamron_14mm_f5_small.jpg

http://www.users.tpg.com.au/~meicw/Tamron_14mm_f8.jpg

http://www.users.tpg.com.au/~meicw/Tamron_14mm_f8_small.jpg

http://www.users.tpg.com.au/~meicw/Tamron_18mm_f5.6.jpg

http://www.users.tpg.com.au/~meicw/Tamron_18mm_f5.6_small.jpg

http://www.users.tpg.com.au/~meicw/Tamron_18mm_f8.jpg

http://www.users.tpg.com.au/~meicw/Tamron_18mm_f8_small.jpg

http://www.users.tpg.com.au/~meicw/Tamron_GPO_11mm_f4.5.jpg

http://www.users.tpg.com.au/~meicw/Tamron_GPO_11mm_f4.5_small.jpg

meicw,

Thanks for sharing and your efforts to do the test.

I'm sure the Sigma 12-24 can do better than these!