It might be passable for me if the problem were were only the edges, but I wonder if it's worse than that, for this lens at least. Even at web viewing size you can see in images three and four that there is something wrong. Looking closer it's not just the edges but the outer third of the image on the horizontal axis is progressively more affected.
It is true that the CV15 can be a challenging lens on some cameras, but on APS-C cameras not to the extent we see here. On the NEX-5N it is a great (and for the price, stellar) performer. The biggest challenge for NEX-7 users is the colour shift you get with this combo but that can be fixed in post, even if it is an additional step to do so, and you can semi-automate the repair. Detail that was never captured in the first place can't be repaired.
Even if this problem affects a broad range of lenses or focal lengths I'm not suggesting it won't be useable, but for some purposes the camera might not be my first choice if that proves to be the case.
Like you I'm keen to see examples made by rangefinder lenses in the 20 - 50mm focal length.