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I did perform a few tests but nothing extensive, and i did see slightly more details in the shadows; as for an iso difference comparing the native canon iso of 160 vs the equivalent iso of 160 from magic lantern i didnt see a difference, and if their was one it was very minor. The highlight tone priority is suggested to be used when you use it with a negative magic lantern iso. I have not done any tests using highlight tone priority but i do know a lot of people either loved it or hated it when they used it without magic lanterns iso.   

First select to use the magic lanterns iso in the iso selection than set magic lanterns digital iso to -0.3ev and canons digital iso to 0, now you will get the equivalent iso for example iso 200 will really be iso 160. let me know if you need any more help.