Which is one of those things falls into the "misunderstanding of statistics" category.
Everyone in the whole world could be the most brilliant of brain surgeons or rocket scientists - and yet 50% of the population would still have an IQ under 100
I have tried a few combinations, do you mean the 4K eshift on. Once I turned the passthrough 4K setting on the Yanaha then the option for 4K shift on the JVC X5000 is greyed out to on and you can not alter this setting.
Going back to the Yamaha 3050 when the 4K passthrough setting is on there is a considerable difference in Sharpness, detail and colour. The picture with the setting on 1080p is softer and with less detail.
Also I will be getting an XBOX one S for the 4K Discs.