Hi Luis,
You and I have different notions of just what an MTF curve is. To me, it's a plot Contrast as a function of spatial frequency. Typically, provided the lens is symetric etc, such a thing migh resemble a Gaussian function with a certain full width at half max. That point at which the contrast is ruded to half, might be broadly considered the lens resolution. The curves you've shown here, are exactly like what I tried to describe earlier as being the way DSLR mfgrs describe their lens performance. It may be possible deduce an MTF from such plots, provided one has a plausible idea of the MTF functional form; and provided, say, one could fit that function with two parameters.
In any case, the general graphs you have shown here bear out my point that when you view, for example, the Leica data it shows a series of plots of sharpness as a function radial displacement from the lens axis. In the case of the APS-C sized sensor, one only has to worry about performance out to 12mm. All those data points beyond that would miss the sensor entirely. All lenses show this sort of general behavior and the question is will it be good enough out to the smaller sensor edge. If you are designing a lens for MF, you have a lot extra work and expense to get good performance out to these larger distances. That's all I am saying.
Note also that that wide open data at 30 lp/mm, which represents sharpness, does not directly say that the lens is capable of 100 lp/mm. One might say, qualitatively that it's sharper than a certain other lens. Will it resolve 100lp/mm? Show me the MTF.
