C100: Buying a Sigma 18-35 as a partner for my Tokina 11-16

I just Picked up Sigma 24-105 f4 art series and update the Firmware through sigma usb dock, now it autofocus on all apertures. I also have Sigma 18-35 1.8 fantastic lens autfocus very well with my C100 MKii, and Sigma 50-150 Ex DC HSM, a beast of a lens and very sharp, it only AF on the wide end.
 
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