yes you will notice a difference especially going up to the new Dolby trueHD and DTS HD master audio from your blu-ray player. Run everything HDMI for the new audio.
I came from a older yamaha as well and the 1900 blew me away. It was in a different league as far as power and sound quality.
One HUGE difference was the radio tuner. Went from hardly any stations with a lot of hiss to TONS of stations both HD and non HD with hardly any hiss.
I am trying to remember what model I had before but it wasn't very high up and came from a theater in a box thing. I want to say HTR-5040? maybe I am wrong. I still have it and can look it up if need be.
Mine was a really low end model so maybe the difference would be bigger for me. That's one thing to keep in mind. I am not sure what the 3090 is.