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Actually, there are three tele-converters in the Contax line. CZ calls them Mutars: standard 2x, APO 2x, and APO 1.4x. I have both APOs and, in particular the 1.4x, have no reluctance using them image-wise. Due to mechanical clearances, the APOs operate with a subset of the CZ C/Y lens lineup. The standard 2x is compatible with all lenses, including the Distagons.
I never heard about that. I've seen the Mutar I, II and III, but none of them are labeled APO (nothing about that in the data sheets). Aren't you confusing them with the Leica APO Extenders?