1. A method for determining a deviation of diffusion-weighted magnetic resonance (MR) image data of an examination object from Gaussian diffusion behavior, comprising: operating an MR data acquisition scanner to acquire first diffusion-encoded raw data by executing a first diffusion-encoding gradient pulse sub-sequence; operating said MR data acquisition scanner to acquire at least second diffusion-encoded raw data by executing at least one second diffusion-encoding gradient pulse sub-sequence, each of said first and second diffusion-encoding gradient pulse sub-sequence comprising at least one parameter that determines a sub-sequence characteristic as a function of time, and wherein said at least one parameter is changed during the acquisition of said at least second diffusion-encoding raw data relative to that parameter during acquisition of said first diffusion-encoded raw data; in a processor, reconstructing first diffusion-encoded image data from said first diffusion-encoded raw data and reconstructing at least second diffusion-encoded image data from said at least second diffusion-encoded raw data; in said processor, comparing said first diffusion-encoded image data and said at least second diffusion-encoded image data to obtain a comparison result; and in said processor, making a model-free determination, based on said comparison result, of a deviation, of at least one of said first diffusion-encoded image data or said at least second diffusion-encoded image data, from Gaussian diffusion behavior, and making an electronic designation of said deviation available as an output from said processor.