Which 50mm for the Sony?

I'd disagree. While the bokeh is harsh wide open, it actually gets much better if you stop down a bit. At large apertures, the 50/1.7 delivers incredible central sharpness (corner sharpness is poor wide open), and at smaller aperture, you'd struggle to find a difference between any of the three. They're all extremely sharp.

Also, I don't see the fringing problems. There's pretty much no CA.

I think all of them are pretty good. 50mm lenses have been around for a while, and they're pretty much perfect today.