The tested Sigma consists of as many as 21 elements positioned in 15 groups. It means the light might reflect from as many as thirty air-to-glass surfaces. Even if Sigma employed the most efficient anti-reflective coatings which lose just about 0.3% of light on one surface, the transmission of the whole instrument would barely exceed 90%.
The photos below prove clearly that the performance against bright light of the tested Sigma is far from perfect and the problems get more and more serious as you increase the focal length and stop down the aperture.
In order to defend the lens a bit you should notice that light artifacts are seen mostly when the sun is inside the frame; if you move it outside the number of flairs and artifacts decrease sharply, sometimes even disappearing completely.
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