EOS Tokina 17mm-good choice?

[Sertur]

Hi,
I was thinking about the Tokina AT-X 17 mm lens. Is it a good choice? Or how 
about new Sigma 15-30mm? New Canon 16-35L is a bit too expensive for me, and 
17-35L a lot of mixed reviews. So, what is the best way to go beyond 20mm 
lens?
S.
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