Picture quality should be excellent, but you're in /r/AndroidTV so you probably want to know about that part.
It's a 2017 model so it should be using the newer quad core MediaTek chip. Philips stuck with the old, abysmal dual-core SoC for far longer (still?).
So you should be getting the best embedded Android TV experience widely offered right now.
Sadly, that's still not very good. Android TV is a solid OS, but the SoC is still ridiculously underpowered. It performs on the level of your typical $50 budget phone and has to drive a 4k screen.
Some apps are well optimized and run smoothly (Netflix) others are a pain to use (Amazon Prime Video).
Kodi works and works well enough, this and the ability to easily sideload apps if necessary are Android TVs biggest strengths.
However, the fact that after all these years there still is a massive lag when changing the volume (takes seconds for the overlay to appear) is inexcusable.
Other smart TV solutions aren't that much better, though, and Android TV still is the most powerful and flexible solution out there.
Something every potential Sony Android TV owner should read before purchasing:
https://docs.google.com/document/d/1EPzlq_ipIPMCDoMqMgDl0IuKmTsMoZHeKKwE_zxbFUk/pub
Conclusion: Buy a dumb TV with the best display panel and picture processing and then use a NVIDIA Shield for Android TV.
I own two Sony Android TVs and two of their smartphones. Every single device had been a let down. Never again will this company get my money. Such a shame too because I love their designs.
I have a similar Sony model. The color and screen are gorgeous, and the built in Chromecast has become the most regularly used feature for me.
I still use my TiVo for most of the smart apps, but I've tested them (particularly while casting), and they work great.