I would return it...ship it back Monday.
A. You want the 85mm GM, probably make you happier,
B. You still have an amazing 50mm in the Sigma, which I agree, based on your samples, has nicer bokeh.
C. If you haven't already, you might also try the little FE 55mm 1.8...It's impressive imo. Bokeh looks good to me. It is supposedly not quite as sharp wide open as Sigma or Sony 50mm 1.4 ZA, but excellent regardless. I have one and am very pleased with it. Really love its small size.
Probably what I will be doing...
This image is probably the one that seals it...I love shooting into the sun...it backlights soooo nicely...the Sigma Art adapted doesn't really struggle with this, oddly enough. The Sony FE 50 really did...a lot, and then it has these odd flares, with a green tint to them...
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