Yikes, that cyan color shift looks nasty on the NEX7. I guess I should have tried the Zeiss ZM 21mm on the NEX7 when I still had a NEX7 (and the ZM 21). On the M9, I get the cyan edges with the Voigtlander 21, but not with the ZM 21. I wonder if that would hold true with the NEX7. The ZM 28 worked really really well on the NEX7 though.
Both concert photos look great!!! Don't you also have the native Zeiss E 24/1.8? Other than the extra 3mm, any other reason you'd use the Voigtlander 21 over the Zeiss 24/1.8?
Thanks for the photos on this excellent thread Dan!