Lensrentals.com made a nice comparison of UWA lenses:
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Pi, ankorwatt says, and pictures prove that, the Sigma has not worse bokeh, than canon has, despite it has less CA and is sharper - optically better. No more, no less. And no one says the bokeh of 35 mm f1.4 lens is as nice as 70-200 f2.8 II or 135 f2 for example. But from 35 mm f1.4 lens bunch it is the best one.I don't have any problem to understand that the back ground or fore ground can be nervous , but here are the 2 lenses compared at the same distances and there are several distances.But neither of them reveals anything like this:
Your "several distances" are too short. You concluded that both lenses have wonderful bokeh, which is incorrect in many situations. They typically include shooting half-body environmental portraits, not miniature toys; and not always wide open.