As @lalitk suggested, the only way to know for sure is to buy the Pass and compare with Ref 6 in your system. I’ve gone almost all-VAC here (across 2 systems), and STILL have trouble letting go of my Ref 6. I’ll post it for sale, then almost immediately regret that and take it down lol. It also feels like the current market is somewhat soft on Ref 6 - the 6SE goes for a lot more, and 5SE goes for not much less, which makes NO sense. A 6 is far closer to 6SE than 5SE, and it’s still upgradeable by ARC!
Agree, the Renaissance V simply wasn’t enough to compete. Even versus Master (at 2x cost), the Ref 6 gets some licks in - its rendition of bass frequencies is just perfect. The VAC preamps have more midrange clarity and "sparkle" (for lack of a better term), but versus a solid-state preamp, Ref 6 should find advantage in its (slight) fullness and sweetness there.
I still have no great anxiety about tube supply...and I'm in my 40s, and my main amps use 16x of KT88 plus 8x of 6SN7. Anyways, don’t sell the Ref 6 first!