the way I judge a lens is pretty basic: find the highest quality wide open. based on one good photography, you can really assess the performance of the lens. Skill of photographer varies too greatly among lens owners, and anyone can take a bad photo. Also, being a third party lens, less working professionals will use it because they cant get serviced by CPS. The 18-55 stm is an entry level lens that has great optics, but I'm sure the sample thread is probably not very impressive due to the target market.
quite frankly, at this focal length, speed of AF is not terribly important either, so that becomes a small factor for the AF argument.
The thing with this lens is it's sharp and that's great (but also not most important), but also it produces very busy backgrounds wide open. I am not speaking about AF's, build quality, or whatever else. I think the 35L produces nicer images overall. More - I think the Samyang's 35mm makes nicer images, too bad it doesn't have AF.
Ahh and to others:
Trolls are your mothers (the same kind of an argument as yours - "he is troll, because he is troll").