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well i mean the 11-16 is one of the best wide-angles for the crop, and even FF's @ 16mm (other than the 14-24 for nikon's i guess). you should search up photozone.de 's reviews and see how much sharpness the tamron has @ 17mm and at apertures you see yourself using. i've owned it before and corner sharpness is not one of its forte's (if that's important to you).
the tamron is okay at what it does and it's a good price/performance ratio. and since you mentioned portraits i'd say ur 50mm f/1.8 is sharper than the tamron @ f/2.8. the tamron's just something you would sell in the long run imo, but not the tokina if you keep shooting on crop bodies (or even FF @ 16mm).
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