Sigma 35mm f1.4 DG Art II vs LUMIX 35mm f1.8: Which is Better?

When the Sigma 35mm f1.4 DG Art II came in for review (linked here), I was immediately quite shocked. Sigma had managed to make a lens that's pretty much the size of the LUMIX 35mm f1.8 (reviewed here) - which is one of my favorite lenses. And even on Reddit, I remember coming across a thread asking about whether or not someone should upgrade. That, ultimately, is the wrong vernacular. I'm going to tell you why this is the worst thought you can have in the post-capitalistic world that we...