Check the Zeiss Contax 35mm MFT charts, then compare them to the Zeiss Contax 645, Zeiss Hasselblad, and Zeiss Rollei MTF charts, paying particular attention to the distance from center (i.e., crop out information on the medium format lenses past 25mm).
Additionally, there is no standard for MTF charting in the photographic industry. Zeiss leads the way by taking s&les from the production line; many other manufacturers (can you HEAR me, Canon EF series?) publish only their CAD readouts without accounting for the less-than-perfect manufacturing process.
Lastly, lines per millimeter is not the best way to describe the apparent sharpness of an image; acutance, that is to say, edge sharpness, corresponds very will with viewer's impression of sharpness, and is something to which the Zeiss engineers pay particular attention. As with other esoteric pursuits (e.g., loudspeakers, musical instruments, yada, yada, yada), numbers can be made to say anything; the proof of the pudding, in this case, is in the viewing. I'll take my Hassy 503CW/Super 250 chromes up against anything in the world (the ones I don't screw up, anyway).