Yes your TV will show 3840x2160 on all channels. This however is only telling you the panel capacity - NOT what the resolution you are seeing actually is. Comedy Gold in 4K..? :-)) No - on the V6 guide that's the place of channels 999 and 555 only - for now. Other ways of course are Youtube and Netflix, where 4K is available.
As mentioned previously, for 4k you need to have a suitable 4k hdmi cable connected from the V6 box up to a 2.2 compliant hdmi port on the TV. With our Pannys, these are usually ports 1 and 2. You have a 58" inch panel, so guessing this is the EX* series - which will be the same re ports - use HDMI 1 or 2, though refer to manual to be certain the port is 2.2
Secondly..as mentioned also previously..go into settings, and select 2160 ONLY..leave 1080 and other settings unchecked. 2160 pass through auto appears/ticks once done and re-checked. These settings will ensure true 4k, whilst retaining the best PQ on other channels as would still otherwise be the case.
You can disagree all you like. The Panasonic DX and onwards 4k sets, always show 3840x2160 on all channels - whether using the V6 or not. But standard def, is still standard def, and albeit the capacity to upscale exists..doesn't mean it actually happens.
In fact I just realised that the manuals to my own previous EX and present EZ..were actually very complicated, and I don't really understand a thing about the sets. Why does the adapter plug have three pins..??
My LG does the same... if the V6 is set to 2160/2160 pass through only, then the input signal on the TV for ALL channels/apps on the V6 shows as 2160/4K. The issue isn't the telly... it's the V6. I am guessing that all tvs will be the same.