Far too early to declare exactly what is the compelling reason(s) to buy the Oppo-203.
If you don't want to get into 4k video that takes away one reason on the face of it.
For myself, 4K is a non-starter for some time as I will need to replace my non-4k JVC projector and more than likely my pre-pro, my AT screen and my HDMI cable.
Granted the HDMI cable is the least of it but the deciding factor as always for me in A/V, is the source material.
Give me UHD movies mastered in 4k or 8k that I like that will convince me to re-buy them when I already have 2k versions that look great.
I'll have to go to a much larger screen and perhaps move my theater seats closer to that screen.
Unlike audio, video is thoroughly quantified.
No matter who you are or what you believe, the physical limitations of what your eyes can resolve at any given distance is a known quantity.
I'm not going out on a limb to say that 90% of consumers at least sit too far away from a given screen size for their optic nerve to resolve the resolution displayed even at 2k(1920x1080).
Further, how many consumers pay for an expert to calibrate their displays so that the colors, contrast, grey scale etc., are even remotely accurate?
As much as increased resolution and actually even more is the leap in color depth that 4k provides.
Minuscule.
Well, now that I've bloviated beyond belief, I'm waiting the Oppo above the 203, 205?, as I currently have a 105 and my main interest is in sound quality for my theater room 4k or not.