falconeye, first off, don't be ahead of yourself by assuming that I didn't read the article from Zeiss or my supposed inability to read figures.
If you need reminding, MTF curves do not always tell the whole story of a len's performance. The MTF curve here are derived from digital image files. The MTF curves for a lens shot with the K10D and K20D or K-7 will be different simply because the number and size of the sensor pixels, design of the low-pass filter, sensitivity of a CCD to CMOS sensor, the algorithms used for image processing including degree of sharpening. All have an impact on the MTF.
So please don't say it doesn't matter that the camera used was a K10D and that one can extrapolate how it will perform on higher resolutions. The fact is the MTF curves will vary with different cameras models and brands. No need to make excuses for photozone. Their test results are relevant only for the discontinued K10D.
K20D DA 15mm