I think I became ‘big screen skeptic’ 
My big screen life began with 40" FHD TV, then 43" 4k TV and now 55" 4k TV.
What I have noticed is that while I didnt need that much antialiasing on 43" now I need it on 55" in 4k!
In XP11 I have the AA slider in the middle (4x SSAA). And that seems to me like quite a lot as the GPU needs to work hard in 4k plus it needs to work harder with lot of AA.
As I mentioned already in other thread, we need affordable 8k, or at least 6k at this point 
43" 4k seems like sweet spot to me.