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thanks! i haven't used the c/y 28/2.8, but zeiss's mtfs indicate that the contax g version should be a slightly better performer, especially as you move away from the center. on the NEX-7 i'm sure the c/y would perform better in the corners though. i have to stop down to f/11 to get decent extreme corners on the 7 (plus color correct the corners), things look much better on the 16mp NEXs though.
From my unscientific experience given my particular copies I'd say the Contax G on a 16MP NEX 5N rivals the CY (28/2.8) on a Canon 5D2 on the per pixel sharpness. And in my mind that is quite an achievement given the difference in pixel density.
People are rightfully saluting the CY 28/2.8 for colors, cross-frame performance and so forth. And the sharpness for landscaping is good, but not exceptional like e.g. the ZE 21/2.8.
What the CY may have, compared to the Contax G, is more Zeissyness.