Two weeks ago i had the same listening: 800D3 vs 802D3 at my dealers room.
That room was a bit overdamped for me, but one thing was very clear: More bass authority on the 800.
And... I was asking him if i'm mad, but the 800 sounds clearer and a bit opener in the mids and higher mids.
Ended up with buying a pair of white 802D3 as my room is a bit too small for the big bass of the 800. And the extra 8 grands are also too serious for my bank account...
Together with my Nubert NuPower A (german manufacturer, very underestimated and way too cheap for what they do) it sounds very clear and powerful and i'm very happy with that decision.
Also bought a DB2D-Sub. Wow!
Before i had the wonderful N802 in cherry for 17 years. What an upgrade!