Now for the Sony STR-DA3700ES. The sound quality compared to the Yamaha is kind of a draw. The Sony doesn't reproduce instruments as impressively, but voices are a touch clearer and the punch that was missing with the Yamaha is there. Sony also allows a lot wider range to the EQ. It seems like you would get used to either.
As far as connectivity they both seem to have pluses and minuses, but the Sony 3700 only has one HDMI out and I know I want two. The Sony 5700 and Yamaha 1020 have two matched, but the Sony STR-DA2800ES has three; two matched outputs plus a zone 2 output. The B set of front speakers on the Sony would be nice to have as well, since I have a massive basement, and it would be great to add another set of speakers away from the theater in the future. The HDMI on the front of the Yamaha is nice to have as well, but easily solved by laying a cable along the side of the unit from the back of the Sony.
I listen to A LOT of radio both AM and FM. The Sony is conspicuously missing HD Radio, and the tuner on the Sony really sucks. Using the antennas packaged with the Sony connected to the Yamaha, I easily get HD Radio, if I intentionally bury the antennas it slips into traditional analog, but is still very clear. The Sony has to have the antenna placed absolutely perfectly to get clear stereo sound, but it still isn't as clear, and AM is the same brutal AM sound you can get on a clock radio vs the crystal clear HD on the Yamaha. I know I could add HD Radio to the Sony, but I hate buying something new knowing I will require a workaround.
If I can tweak the settings on the Yamaha to get the bass punch I am looking for, I might be sold.
Then I would need to figure out if I can cut corners with that purchase and go with the Yamaha RX-V773WA, so I can get 4K, a front HDMI input, and a couple of other improvements.
The 2013 models from both companies offer some great enhancements, including 4K. The changes on the Sony 2800 and 5800 changes are massive though with the addition of Zone 2 HDMI out, 4K, and Control 4 automation for lighting, etc (but with the $700 price tag, this is easily forgotten). Very tempting and I keep having trouble seeing really big gains between the 3700/5700 or 2800/5800. Maybe I am missing something.
Sorry if this is rambling, but lots going on in my mind right now.