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Also, if you can find the RS version of this lens, it has rounded aperture blades for better bokeh. Also, the Sony version has 8 pins and gives 5 axis stabilization and a bit more consistent look compared to other Sony lenses.
I am nowhere near the connoisseur of 50mm lenses that most of the respondents here are. That said, if you are willing to work with an LA-EA4, the Minolta (AF) 50 f/1.4 gave me remarkable images on the a850. I've often thought about picking another one up. Shot at f/2 or so, it gives really excellent results for environmental portraiture.
(Would an LA-EA3 work with the A7r2?)