Highest detail cartridges

 I sometimes envy your level of absolute certainty about your cartridges and what you are hearing. I on the other hand am always a skeptic. My point about the grado was precisely its age since manufacture, not its hours of use.  My TLZ, which used to be my favorite cartridge 30 years ago, deteriorated while in storage in its black cylinder. As to the excellence of the Acutex cartridge, get yourself an Acutex LPM320STR3, or M320, and then we’ll talk. My remarks do not pertain to any other Acutex models. 

Chakster, Based on your own observations, it would seem that there is a dissociation between low "moving mass" and high levels of "detail retrieval", the latter being a very subjective judgement that requires a consensus among many listeners to be taken seriously, I think.  I know you like your Grado XTZ, but given its age, it is probably not advisable to take its performance as a paradigm for all other MI or IM types.  (I think those Grados are more properly thought of as IM [Induced Magnet], like my Acutex LPM320 and M320.)  My own Grado TLZ ain't what it used to be.  You also mentioned ZYX cartridges as being detailed; I would agree.

Chakster, I am not sure why you are so obsessed with stylus tip mass, which should really be termed "moving mass", to indicate the total mass whose inertia needs to be overcome in order to start a transient, but in order of class, moving iron cartridges are said to have the lowest moving mass, to be followed by moving coil, and then by moving magnet types.  I'm sure there's quite a bit of variation and perhaps even overlap within those categories, but I strongly doubt that any MM cartridge could be champion of that specification.  Assuming I would care.
Anyway, to the OP, it seems to me that certain brands are more known for detail retrieval than others, whether or not that was a design goal of the manufacturer.  Two brands that fall into that category, in my opinion, are Lyra and Audio Technica.  I'm thinking of whether to add Decca to that list. The trick is to get the details while remaining "musical".