I just put together the following table of symbols from the STIX fonts for comparison. However, comparing this image with the others is made difficult by the fact that it is was generated by hand in InkScape (grumble, Adobe CS2 and Leopard, grumble) rather from a LaTeX document. Therefore, it was difficult to accurately rasterize the vector image such that I know the relative sizes and weights are accurately portrayed.
Update: oxlahun noted that I forgot to put
\leadsto in the table.