If it is not a 4K TV it will not support HDR Color (High Dynamic Range). TV must be HDMI 2.0a to handle the bandwidth. 99% of Sony TV's are not local Dimming. Your TV is Edge Lit LED, which is what a majority of the 1080P sets are, unless you get to the top end.
There are three common types of LED Screens
1. LED Edge-lit (may have uniformity issues, but my Sony NX810 doesn't have any issues)
2. Full Array LED (LED throughout the entire Picture) My Sony 65X850C 4k Has this
3. Full Array LED w/ Local Dimming (Think of it as there are zones sections of the TV that can turn off the LED depending on the picture requirements) This is the best on type for LED
For HDR to be fully realized, they are in the process of establishing standards. A TV must meet minimum darkness and brightness (contrast) requirements. Right now I would almost wait until those standards are fully established. My 850C is HDR compatible, but does not have local Dimming, so it probably will not meet the newer requirements.
Bottom Line, unless you are sitting relatively close to a 70" 4k Screen, the resolution will not be such a huge benefit. Where 4k is supposed to shine is with the HDR color enhancements along with faster internal Cpus and more bells than a 1080p set.
I did not discuss OLED TVs that is a whole different beast, but OLED with HDR would be the best, and most expensive pick