I think may improvement if mag-upgrade from 1080p to 4k... But its not really that much kasi nga resolution lang ang nagchange, an picture nagiging more detailed.. I have a 1080p PJ & a 4k HDR TV, hindi ko ganun ka pansin ung malaking gap in improvement.
But if we're talking about upgrade to 4k with HDR, then ibang level ng improvement pinag-usapan dito. I'd say having HDR capability is really a game-changer. HDR in 4k reso gives the PQ several notches above the 1080p PJ (Dito ko naappreciate ng husto ung 4k HDR TV ko). I thought how much more if 4k HDR tapos OLED pa ung TV?
I think 4k HDR for PJ is still in its early stages (unless Sony PJ, which costs way above most people's budget). TV on the other hand, has a matured 4k HDR tech plus ung pagpasok ng OLED na walang sinabi PQ & black level ng PJ. Screen sizes for TV had grown over the years na common nalang ung 65" na TV.
Kaya, ito ung final route ko, upgrade 1080p PJ to 4k HDR OLED TV kahit 65" lang..