Hi Mike;
Sorry, I think I missed your post back in June regarding if I notice a difference in sound btw the Denon and the Yamaha.
As for music, they are pretty much the same, very similar in performance. As far as movie soundtracks, I think the Yamaha seems to have slightly better separation and seems to bring soundtracks "alive" a bit better than the Denon.
This is not a knock on the Denon whatsoever, it did everything asked of it and did so impressively. I just think the Yamaha performs a bit better when watching satt and movies. The YPAO may help out a bit in this arena as the 3803 didn't have a similar feature, but considering I calibrate SPLs about once a month and typically use DTS-ES when available or DD-EX, both receivers have the same features here and the configuration was identical.
I'm sure the HK does a solid job on most material as well, but I'm sure you could answer that question a bit better than I could... -TD