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That looks very nice, and I certainly don't see any color shift in the corners at all. hhhmmmm. I remember passing over the ZM 25 for the NEX-7 based on some samples I'd seen, but seeing these, it may have been a mistake... I'm using the 24 Elmar now, which is razor sharp corner to corner on the NEX-6, but lacks the wider aperture of the ZM.
The Elmar's an amazing little lens, and I'm not sure there's another 24ish I'd put ahead of it for landscapes. I'd say the C-Biogon 21/4.5 comes close, but there's so few digital cameras on which it can reach its potential, I can't even say it competes. I was stuck on the Elmarit 24 for a long time, and I'm fairly certain I'm going to miss it the next time I'm wandering around a big city at night, but I wanted something more general purpose in this focal length, and the Elmarit was not pleasing closer than a meter. I'm hoping the Biogon 25 does well with city lights, but it'll be a while before I can test that out.
You've got me wondering what kind of corner performance difference there might be between the 6 and the 7 with the Biogon. I've got a 5r right now, which I think is the same sensor implementation as the 6. I'll have to test it out.