I am using a Yamaha Aventage RX-A2010 which I think came out around 2012 along with a Emotiva XPA-5 amp. I am only running a 5.1 set up right now and I don't have a 4k tv. I seen a real good price(still not cheap though) on a Yamaha Aventage CX-A5100 which I have heard great things about. My question is with only running 5 channels and not using any 4k will I see that much difference in sound between my current set up and the 5100? I am probably 50% music listening and 50% movies and tv. My speakers are Definitive Technology mythos st up front, mythos 10 center channel, mythos ones in the rear and a SVS pb12-nsd sub. I have had this set up for a while and always get the itch to try to improve I am just not sure that's the way to go. Any thoughts from anyone would be great. Thanks