Soldato
Without any real knowledge of the remake I can understand lots of people see it this way. It's equivalent to a full PS4 game (comes in 2 discs). The digital download itself is about 100 gb with 30-40 normal game hours.
Much much longer, I was surprised (seen for myself, it's far bigger without getting into spoilers)
Game ends when you leave Midgar but see above comments
There's side missions and what not, but the main story is the same, Square have fleshed out a lot more from the original and expanded on it (again without spoiling I can't go into detail). But I will say what often seems like made up stuff much of it is just fleshed out content from the original.
The scene on the well talking with Tifa I'm almost certain on the original that happens on the little town post Midgar (Nibbenhiem?) When it gives you the huge history dump.