It's rather obvious that good performance against bright light is very difficult indeed to guarantee in such lenses as the tested Sigma. You deal here with a fast instrument with an imposing zoom ratio, encompassing a range from significantly wide angle to the classic telephoto lens. The presence of 13 groups of elements means you deal here with as many as 26 air-to-glass surfaces where you can catch unwanted reflections of light. At the same time movable optical elements make it difficult to put apertures and ribbing inside the tube of the lens.
Taking it all into account the Sigma A 28-105 mm f/2.8 DG DN fared quite well in this category. You can catch flares but they are few and far between and not especially intensive. What's more, the optics specialists managed to avoid distnct and widespread contrast losses.
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