I heard the same Stabi S with both the 4Point9 and the Stogi Ref 313.
Same exact cartridge.
The 4Point9 is VERY detailed…to the point of being sterile. It’s impressive at first…then it’s just exhausting. It’s also lacking fullness
The Ref 313 is fuller and more musical. Less resolving but also more enjoyable and relaxing.
That being said…the entire Kuzma sound is too sterile and dead for me. I didn’t buy the Kuzma setup
I prefer musical with fullness and warmth.