Supex 900 super vs. 900 mk. IV

I am really enjoying the 900 super. The bass response is very nice, and the mids are out of this world. The details can get a bit sketchy, but not bad. Does anyone have any experience comparing the two? How does the 900 super stack against the 901 mk. IV?
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Did you mean the 900 or 901? The 901 was the high output version. I sold them for years and liked the 901 better. Of course I didn't have the phono preamps in those days I do now so I might feel differently if I were to hear them in my present system but both were good.