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"Every 35mm F1.4 DG HSM will be checked using Sigma’s own MTF measuring system, “A1,” as will all new lenses under the Global vision categories. This system uses 46-megapixel Foveon direct image sensors to pick up previously undetectable high-frequency details for quality control inspections."
Except that's a 46-megapixel Foveon X3 APS-C sensor, which means in terms of spatial frequency (which is what they are measuring), it is only equivalent to a 15-megapixel sensor or so. That's still pretty good (the pixel pitch approaches that of the D800), just not as amazing as they probably want everyone to think.