Better quality mostly. Although for this leak the quality was really good, only problem was the slight frame rate sluggishness, but was barely noticeable.
Thats what I am saying though - its 1080p. I dunno if GoT is HDR or 4K, but I don't have that hardware currently at my disposal so...
And the only minus in GoT is product placement unavailability. If the show was in the modern world they'd be making mad money leaked or not. Though since this will be the best ever show for some time to come - they will still sell billions of merchandise, material, etc. HBO won't ever lose a dime on this one, because it is simply a quality production. Something most TV/Show producers should learn well, before they take those 'propaganda' money.
PS: Saying that lets hope we don't find the Night King is the North Korean King predecessor and we all have to fight for 'the living'.