I just picked my PS4 up last week. Am keeping my PS3 for now and already sold my Panasonic BDP-220.
A few thought so far.
I have both machines hooked up to a STR DN840 receiver, with HDMI from it to a P55ST50.
My fiancé has a Netflix account and since she's overseas she's letting me use it here. I've used it in the PS3 before but couldn't recall the app or playback quality, and I know it's changed with updates. With the PS3 I have to switch between PCM and bitstream in order for Netflix to output DD+ audio. Amazon still only outputs PCM with either option.
In the PS4, with bitstream DD selected, the same things happens except amazon will output DD in those titles that support it. If PCM is selected, If I recall correctly, it will only do PCM. If watching BDs, you have to access options via the remote to change the audio from PCM to bitstream, if you choose to do so. If they had this same option for the apps that would be great. My question is, since the PS4 seems to have he audio settings reflect three choices...PCM, DD, and DTS (each with priority next to them) you would think the machine would go to that setting as default should the source material have such an audio option present. This way you wont have to constantly switch between formats. I imagine this is the case because of game titles and different games support audio and people may want to choose one format over the other.
As for other differences, I'm still awaiting a Bluetooth enabled remote for BD playback. I liked the previous remote, even if it went overboard on buttons. I really liked the display option where you could select it and it would give the track info, bitrates, audio, etc. the PS4 doesn't do this (yet) but when you hit triangle it will give you some display options, along with a banner along the button with a cover art of the movie and some other info. I liked the more refined display on the PS3, especially on Netflix. When you selected it you could see the audio and video info. Watching House of Cards on netflix I could see it was steaming in Super HD at 1080P, or when it would fluctuate. Probably a personal preference but I liked that feature.
So far playback has been great. Load times are quick, no video or audio issues. I almost think it rivals the PS3 but it could be my ears.
I like the blazing fast menu interface and easier to find options.
Only one game so far, Tomb Raider, and it's improvements over it's PS3 counterpart are evident. The PCM 7.1 on it sounds so much better on here. The surround effects are truly remarkable. I don't own many titles but it's very well done and in look forward to future titles. The sound seems a little loud and aggressive and I had to turn it down from my usual volume.
The remote is well designed but the LED light is too bright and I plan to buy a set if stickers online to cover it up. A BD remote should he out this summer from what I heard but that is to be seen.
If anyone has question on my setup and how it works, etc just let me know!