Objectively quantified? Hm. The only thing I can think of is Meridian's claim of 40% better jitter rejection with their endpoint upgrades.

I would guess that objectively they'd all be reference standard, who can say whether an extra 40% jitter rejection, or any of the other small, incremental improvements are worth it or not to a particular owner?

I'm afraid you might have to go listen and let your ears decide whether it's worth it for your wallet or not!

HC: 861v4/ID40/LPS, DSP5000, DSP5000VC, DSP3100, SW1600, HD621, Oppo BDP-105, Sony VPL-HW55ES
2-Channel: TEAC VRDS-7/Trichord Clock 3/PSU, Avondale S100, Harbeth Compact 7ES-3
Previous Meridian: 5000C, 5200, 7200.2, 6000, 562V.2, 568.2mm, 800v4, 808.2i, 818v2/v3, 861v8, 551, 502