Denon 5308CI coupled with the Denon 2500
Denon 5805MKII coupled with the Denon 3800
Even DenonJeff called the 5805 "a one of a kind product"
and said the 5308 was NOT a replacement for the 5805 but a replacement for the older flagship 5803A.
And he also recommended to a poster that he might be better off keeping his 5805 and mating it with the upcoming 3800 Denon bluray player as the poster was looking to someday move up to the new Denon separates.
With that said I should be getting my 5308CI soon but it will have to beat out my present receiver the 5805MKII if it is going to stay in my system for any length of time.
2 channel sound quality is a biggie for me and the 5805MKII does 2 channel very, very well. How well the 5308 does 2 channel will be a make or break test for it.
Also the internal amps of the 5805MKII are monsters, very quite, very powerful monsters! I doubt the 5308s internal amps will be monsters but maybe they will be good enough.
I've heard the 5308CI has an improved version of Audyssey compared to the 5805s version. This could be another biggie if true.......
Anyway should be a fun comparsion but I'm not sure which I want to win