Just a followup to my previous post (Nov 2014), ultimately I ended up not being able to upconvert my svhs deck from svideo to 1080 via the Denon, something died or who know what (I'm still pretty sure it worked initially when I got the new tv). So I ended up running composite cable from the svhs vcr to the tv (since it has no svideo input (it would have killed them to put one in?)).
Too busy with other things to watch my tapes recently, but given the ones I was watching were recorded on a (different) slightly out of whack svhs vcr on a not very good cable tv system circa mid/late 90s and at the slowest recording speed, albeit with s-vhs et enabled, when I watched a couple it wasn't like an svideo connection would have made all that much of a difference compared with composite. I do have some other pre-recorded tapes I hope to get to eventually, they may fare better, so perhaps I'll give svideo another shot if/when that ever happens. In the meantime I'll mostly be sticking to those 90s tapes, via composite, if/when I get a chance.
Still fine with the 5805 otherwise.