"Is the dialogue with worth close to double the price?"
High end audio is similar to many things most of us enjoy.
After reading/researching your own ears are the judge. Subjective as anything else. Unfortunately, your wallet can get emptied fast!
I enjoyed the Prologue 2 for a few years after DECADES of lofi on the cheap.
Going up the food chain is only necessary if you're beyond just hearing good music and a gear head at least to some degree.
Upgrading to the HP is the best upgrade for what I intended.Unless I'm ready to just get the lottery rig, I'm so done with hi end.
I bought mine BEFORE the huge price increase. IMO, the HP will present ANY source in its best light. But that's always a subjective along with the YMMV, synergy thing.
My HP is tweaked with 50's RCA coke bottle 6L6's -EIGHT! Same vintage preamp tubes, everything Nordost Heimdall/Frey plumbing feeding Opera Seconda floorstanders and REL B3. I finally hear what I hear in some of the UBER systems at shows- on the cheap!
Hookup a fine table, along with a tubed phono and you're done.