Strange how it's so different...To me it feels like DS1 has grown up, infused a bit of Bloodborne DNA and came out the strongest of the bunch. This game feels so majestic to me...That's the word that comes to mind constantly. It beats the other games in almost every aspect. It's also the most varied in terms of level design while having the most consistent world (BB competes in that category, though).
If you're fantasizing about teams (I think that's a non-factor, actually) whatever team worked on Demon's Souls had a good time with the later areas of the game.