Sigma 17-70mm vs 17-50mm?

Sigma 17-70mm vs 17-50mm? I've the change to buy a Sigma 17-70mm f/2.8-4 DC Macro OS HSM Contemporary for US $189 or 17-50mm EX DC OS HSM for US $230 or US $260 a near mint one (full box). I read that 17-50mm it's sharper and a better lens but I don't know if it worth that much difference… we are talking about aprox US $60. Obviusly it have more light (2.8 all the way vs...

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