Certainly, I was very much confused between Sony 55x9000e Vs LG 55UJ752t. Both cost almost same but LG come with Dolby Vision and Sony don't have or no chance for future upgrade. Only Sony x9300 and x9400 will get DV upgradation. But DV is still in primary phase and will certainly take time to settle. Presently available on few UHD Blu-ray movies and which cost around Rs. 3000/-. Comparatively HDR 10 is bit more popular and widely available on streaming services like Netflix, Amazon prime,Kodi video add ons and UHD Blu-ray movie disc.It is well know fact that the Hardware required for DVs full potential performace is not yet available. So on current set you will get either scale down version of DV or compromise DV performance. TV manufacturers will take 3 to 5 years to make hardware capable to unlock real DV potential. It is also understood that Core stream to DV is HDR 10 but not sure. So HDR 10 decoder can unlock core stream of DV. I have watched few 4K clips and shows on HDR 10 on YouTube and Netflix. You can't ask more from video technology. 4K is way better than FHD and more than enough for home viewing. DV will add more colours and depth to the image which is welcome but not necessary. Samsung has already introduce HDR 10+, enhanced version of HDR 10. Philips and Panasonic are already working on new version of HDR 10 which may further enhance the HDR performance. So in future till DV settle down HDR may take a leap near to DV. Now availability of contains on HDR .... Most of the universily accailaimed Hollywood movies are rebirthing on UHD Blu-ray like Matrix series. Little inexpensive compare to new release movies. Already major streaming services adopted and started 4K streaming services. Netflix, Amazon,Apple etc. Still most of the UHD containts are documentaries and few movies. Still it will take at least a year for UHD to settle down.
I have compared Sony 49x8500 and LG 43UJ752t side by side and frame by frame. I like Sony the most in Image processing, vivid Colours, black level and image depth. LG was not far behind but I sacrifice LG DV for Sony pictures quality. If possibly go for x9000f or x9300 with firmware update for DV..else x9000 is very good TV for next 4 to 5 years.