4k netflix et al soon to follow
Sony will give you a big HD full of 4K movies and you can sort yourself out with Netflix that is releasing some of it's IP in 4K (eg House of Cards - worth a watch).
I've got a 50" TV which IMHO is the biggest 1080p can go.. bigger really demands a 4K screen.
1080p can look gobsmacking - the BBC "pets" show has some great slo-mo vivid shots of cats'n'dogs doing their thing, truly impressive. 4K on a bigger screen would be gorgeous too.
A lot of the picture quality is down to the cinematography and post-production - how much data they squeeze out the picture before sending it to your house. A great example was a recent live footy match on the beeb. It looked so crisp and clear compared to watching a live match on Sky's HD Sports channel. I'll take a guess that it's the same OB tech but Sky squeezes a lot of the quality out by compression because it's got 500 channels of rubbish to fit into its pipe.
Of course you might not care a jot about telly image - lucky you. Your local car-boot probably has a fantastic set that's just up your street for about a tenner.