This lens is amazingly sharp. Even when wide open. The color rendition is superb. I have not seen purple fringing or any other artifacts. Although it is not a primary concern for this lens, the auto-focus mechanism felt like a great improvement over the 63mm. It feels strange to be shooting with a medium format camera casually in the streets, but, it works beautifully!
The only caveat of this lens is that, it is quite big and heavy.
Attached are compressed exempts which I have used in social media, the original files are, of course, much higher quality.