I'm not very good at describing differences
I like all music from heavy classical through to punk, but mainly I like seventies AOR, Eagles, Linda Ronstadt, Steely Dan / seventies progressive or metal, blah,blah,blah.
I have a separate Linn, Naim, Epos system for 2-channel, before I settled on a Naim CD player ( mainly for aesthetics / matching ) I tried the two Arcams, having had previous Arcam CD players / DACs.
The FMJ had more " air " around individual instruments with great detail, separation and imaging, with tracks that thrash, say The Damned first album or albums by Dead Kennedys, Angelic Upstarts, The Business, The Clash, Joy Division, Iggy Pop, Cocksparrer, and so on the FMJ was clear, precise and energetic but not harsh.
What Hi-Fi use a term " unyielding " , probably doesn't mean too much as What Hi-Fi is a comic, but the ace for the FMJ is that it is not unyielding.
I'll have to let the experts describe the difference between FMJ and CD92.