As long as you are not looking at photos you should be fine with YCbCR then.
Display panels are always RGB only, I think nobody here questioned that. If you feed YCbCr to a TV it must be converted at some point, that’s without doubt.
The question is how the TV behaves if you feed an RGB image to it. wesk05 claims that the TV converts RGB signals to YCbCr, applies filters/scaling and then converts it back to RGB in order to feed it to the panel. I’d say that the TV does not convert the RGB signal to YCbCr, as it does not make sense. But nobody can tell for sure, that’s why I have asked the Panasonic TV support about this (don’t have an answer yet).
The Game Mode that wesk05 also mentioned is an interesting thought, though. I have been using “PC Mode” for my HDMI port since I got my TV, as my PC is also hooked up to my AVR. Maybe that’s the reason I am getting a perfect image from my PC (which I have also used for calibration).
That’s why you should be using either Kodi DSPlayer or MPC-BE within Kodi on the PC platform in order to profit from MadVR. It gives you a Full RGB image processing pipeline. Plain Kodi on PC also gave me not more than just an “okay” image quality. With Kodi/MadVR I got a perfect image (especially with NGU scaling in High/Very High, but this comparison is not really fair).
Maybe the PC mode which I am using for the AVR HDMI port might actually be the reason why Full RGB signals are looking much better on my TV.
It probably differs from TV to TV, also depending on the settings. That’s why we need the possibility to use RGB Full on the Vero 4K+. For some people this might not improve things, for others it does.