Chromatic abberation (or "CA") is a specific defect that shows up on high contrast edges, such as leaves against the sky, spectral highlights on water, etc... Usually it looks like purple fringing around the edges of objects.
The "colorshift" issue seen when putting some rangefinder lenses on the NEX cameras is a different issue. It looks more like color vignetting.
The first of the two is a fairly common issue, unless the lens is an apochromat in which case it will virtually eliminate CA's by nature of it's optical design. Anyway it's easy to correct most of the time using the post processing program of your choice. The second of those two is somewhat correctable but takes a little more work and the results can vary.
The CV15 does show some colorshift on the 5N sensor and I've heard the combination of CV15 + a6000 is similar. Most of the time the colorshift is not problematic for me... in scenes with a lot of snow, fog, or otherwise dominated by neutral colors it can become a nuisance.
Overall it's a great lens. Tiny, very sharp, very little distortion, and not much detail smearing in the corners... the colorshift is really the only downside. Compared to the Sony 16... it's a much better lens, but if you're mostly looking at 800px wide images on the web it won't matter much - so shop according to your needs.