I've managed to test(audition) DRA800H / Marantz NR1200 / Yamaha R-N803D / Cambridge Audio AXR85 --> all on JBL Stage A180. All impressions are strictly subjective (i tend to like mid/treble clarity and not much of an bass "oomph").
Yamaha R-N803D: i was expecting more "grunt" and clarity. Slightly "flat" and boring sound. Turned on Pure direct mode - no spectacular changes. I like to listen at low volume levels, and R-N803D wasnt spectacular in that field: emphasized bass (almost boomy), distant treble (although i was much much better then R-N402).
Denon DRA 800H: more treble clarity, slightly better on low volume, tightened bass. Certainly an improvement over R-N803D. I got the impression of a "electrified impulse" sound (clear but artificial). 20% better then R-N803D.
Marantz NR1200: this was a pure winner. On low volume it has the best clarity and balance, tight bass, incorporated mids. Its not warm or muddy/ smooth sounding, it's very precise and clear. I liked it more then Yamaha and Denon. Turned on Pure Direct: even better on low volume. Upon increasing volume, it had (subjectively) the same clear, connected and tight sound as on low volume. JBL Stage A180 started to sound really nice with NR1200.
Cambridge Audio AXR85: didn't impress me much. Sound wise - between Yamaha and Denon. Strong bass, slightly muddy. Managed some treble/bass controls, but i couldnt set the sound right. Also it has an active fan which started to spin during presentation.
In the end i checked Denon DRA800H and Marantz NR1200 manufacture dates and DACs. Any DRA800H/NR1200 units manufactured after May 2021 use a PCM5102A, 32-bit DAC from Texas Instrument.
So this was a test with PCM1502A DAC within DRA800 and NR1200.
Didn't have the oportunity to audition AK4458 unit.
Edit: i went beserk with Yamaha R-N402D hiss from JBL tweeters, so i plugged in old Denon AVR 3803. Very similar sound to Denon DRA800H, but more calm. I'm waiting to pull the trigger on Marantz NR1200... or assemble miniPC / Topping E50 + PA5