I've compared DTV vs FiOS TV, because FiOS TV has Fiber to Home and though I thought there would be difference in Pic quality there was not, IMHO. I did not compare 4K content however, I still utilize my Apple4KTV for that resource.The means of delivering the content has nothing to do with the display device quality. If you have a crap media player and a low bandwidth pipe, the content will look just as bad on a cheap projector as good one.. Content does not specify contrast.. that is a function of the display device. The content that is streamed is not the issue, it is the bandwidth you have access to and the device you are steaming on.
So is it worth it for you to upgrade, that is something only you can answer. I know that the quality of all streamed content is better than what I get from Verizon FIOS.. .. FIOS HD is so poor it can hardly be call HD..
Peace and blessings,