Just published in my Sony NEX review in DAP are color shading results on the Sony NEX-5N with Leica M lenses. The results are markedly different from the Sony NEX-7 color shading results.
Why is this interesting (besides color)? Because color shading (caused by ray angle issues) might well be a predictor of off-center sharpness, at least that is my hypothesis, which I shall be testing with some field work coming soon in my review.
Thanks to B&H Photo for making the Sony NEX-7 and Sony NEX-7 and Sony lenses available for testing— see my gear pages for handy buying links with in-stock status.