Main reason is that it seems to have a random handshaking glitch between my old style PS3 "fat" and PCM output when playing BluRays, where it will just randomly decide the PS3 is sending it PCM 2.0 instead of PCM 5.1/7.1 right at the start of any given movie. Power cycling the receiver fixes it instantly for the rest of the movie, and sometimes it doesn't happen at all, even with the same movie! The thing is, I DO NOT believe this is a defect with the receiver, but rather something unique to my setup/situation. It MAY be a firmware bug, or maybe just that only Sony knows how to play nice with Sony products. On my old Sony receiver, and my new Sony receiver, no such issue. I'm also fairly convinced that if I changed the PS3 to output Bitstream instead of PCM, there would be zero issue. But I don't want to go through the hassle of swapping out my PS3 with a newer one that can support HD audio over Bitstream in order to find out.
The other reason is that BluRay player and TV are or are going to be Sony, so I might as well use a Sony middleman.
Honestly, after evaluating the new Sony ES receiver, I actually like the sound quality BETTER on the Yamaha I'm selling, but its a close call. Actually I'm not sure its better, just subtly different. I think the Yamaha sounds warmer and the Sony sounds brighter, if that makes any sense. It's weird, because I don't pretend to be an audiophile. However, that doesn't mean I wasn't born with the ears of one.