I thought the mastered in 4k thing was a marketing gimmick for Sony/Columbia pictures.

To me 4k is great at the cinema not so great at home thanks to price and living in a small apartment.

1080P is fine for me.

I hate digital projection but i saw some stuff shot on film that looked great in Sony 4K digital at the movies.

And to add to what canofhumdingers said a bad master won't look any better at 4k than 1080P when a really good one will look spectacular on 1080P. So i wonder if the same is true for 4k a good master would look even better.

A good tv is important but a good blu ray master is a must as well. How many releases are just older masters ported over, not very much better than the 1080i butchered and way too compressed HDTV cable broadcasts.