I have been 'upgrading' some titles in my movie collection, and recently got the 1937 film on blu-ray "Lost Horizon". The case says "Fully Restored & Mastered in 4K", but the fine print seems to say it's 1080P HD (High Definition), this seems a contradiction, is 4K the same as 1080P HD? I've got Blu-Rays of classic black & white movies in "new 2K restoration" so it's a little confusing.