Arkadiusz Wieczorek@queserasera ok, the question is what is your main objective for shots?
Sigma 18-35 will be more versatile than these two ones, but really fucking heavy. With these focal length range you can shoot landscapes, street, closeups (because has minimal focusing distance at 28 cm) or even portraits.
I think it will be also sharper at f/2.8 than Sigma 10-18 or Tokina 11-20 on the same aperture, but not big difference.
10-18 seems pretty cool and easy to go, plus it weighs 1/4 of what the 18-35 does.
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