Need your opinions! Sigma 28mm f/1.8 lens

I'm not the SLR lens expert, but if I'm not mistaken, can't you just buy a used MF lens made by Nikon or Canon? It's generally a crime to put bad glass in front of your camera.
 
its no where near really good glass but I think itll be a hell of a lot better then the standard lens i have now.

Just wanted to know if anyone had any experience with that lens.
 
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