Oh well, I didn't really get it for sacd/cd although good sacd playback via coaxial or hdmi breakout would have been a bonus.
Last night we watched Ritchie's Sherlock Holmes (actually not boring as many have said). The opening scene had tremendous thundering sound effects - I've definitely never heard anything like this through the panasonic bd55. Without directly comparing the picture quality (I'd need to swap all the cables), I found it extremely vivid, textures were subtle, lots of high contrast details. So, I think it i a significant step up in both PQ & SQ. (Note: I have only been testing SQ through coaxial digital output)
On a negative note however, I found that voices sounded a bit nasal, especially David Attenborough. This is possibly the kind of thing that improves with break-in...?
Operationally it also works really well - startup is quick. It loaded blu-rays in just a few seconds whereas the panasonic (and the denon 250bt) would huff and puff at startup as well as loading even a cd let alone a blu-ray. It is also very responsive, fast forwarding etc is good.
Will do more experimenting later this weekend when it's dark enough.