Really enjoying the couple days I've had with the 940c so far. Though we had a decent 55" Panny, the jump to 75" and 4K is just remarkable, and yet also remarkably easy to get accustomed to. I was worried the TV might dominate the room, but getting it mounted really did the trick. about 10-11' of distance is pretty perfect too though I realize we're not getting the "full benefit" of 4k that far back (tbh just in terms of FOV occupied by the screen I wouldn't want to be any closer or the screen to be any bigger).
Random observations:
-All the apps and options available are actually really cool. Netflix button seems kind of gimmicky maybe but we use Netflix a lot so I don't mind it.
-In terms of menus & options, I just wish navigation back and forth was a touch easier. (afaik) there's no overlay menu like I'm used to, just a full-on menu. It also takes many taps to get to settings (again unless I'm missing a shortcut). Half of this is probably just me getting used to the remote though.
-I know this is the bane of every 4k owner...but I do wish there was more 4k content.

It doesn't even seem very easy to find on Amazon (afaict) but at least Netflix has a category for it. I'd buy the Sony box but it doesn't really seem worth it. I really do dig that resolution though and I'd pay decent money for more content.
Haven't played games yet, but that should be fun too, especially with the 20ms lag in game mode (which was actually one of the random factors that pushed me to get it).