This very beautiful weekend in autumn I took my old 14-24/2.8 Nikkor and the much less older Sigma 14/1.8 Art with me to try and see what happens to both in front- and sidelight. I knew the Nikkor is not good in handling flares, what i didn't know was, "is the Sigma although wider open, better in avoiding flares?"
It's no problem to provoke the Sigma showing bits of flare. These are just not as rainbow-colours as the one from the Nikkor.
This kind of flares I find hard to deal with in post production.
1 ½ stop faster and less issues at f/5.6, cool.
But that's only one bonus (and to be expected from a prime this size and weight)
The other is the combination "close-up, wide open"