Just got a Tokina 11-16 f/2.8 and wanted a quick test to see where it stands in terms of IQ.
Unfortunatelly the comparison with the sharpest lens I had so far (Sigma 150mm f/2.8) is kind of difficult (wide vs tele) 
My next choise is my ultra sharp Sigma 30mm f/1.4 which easily outperforms my Nikkor 50mm f/1.8D.
1. The test is of low quality (handheld) since I intented it to be a quick hands-on check. But…from the result I got, I won’t bother doing another. The two lens are not comparable
2. Tokina has A LOT of CA…I shot in RAW and saw them, I shot in jpg and in some conditions D90 didn’t manage to get rid of them all !!!! At jpeg though the CA are almost non-existent (see the SRS logo in the border crops).
3. The center of the Tokina doesn’t seem to get better from f/4 onwards…This means that either the resolution outperforms my eye’s resolution or CCD’s resolution (Nikon D90) or is it’s top res. Can’t decide !
4. The corner crop is actually …BORDER…not Corner. As far as I saw, Tokina’s borders was 0.5 stop better than corner so do the maths. I didn’t do the corner crop since sigma is a very nice lens and I do not want to ruin it’s reputation…
5. As I see from photozone.de , 11mm is not Tokina’s best (14mm supposed to be the best) but again…I won’t bother do another test at 14mm !
6. Camera is a Nikon D90, standard picture settings (no sharpnening) and test was done at ISO200 with ceiling bounced flash (in order to exagerate the CA).
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