Has anyone upgraded from UB420 to a UB820?

Hey all, yet another Dolby Vision question.

I currently have a UB420 that works flawlessly. I have an LG C3 and have managed to amass a decent 4K collection of which apparently 25 titles support DV. Can anyone speak to the improvements they are seeing after upgrading? For now I’m pretty well convinced I should hold off as it seems overly expensive for a minor improvement, but I keep wanting to actually see the difference (or an accurate representation of the difference) just to know what I’d be missing.