I am puzzled about one thing and hopefully someone can help me understand this. Nikon's flagship D5 has a 20 MP sensor and the D850 has about a 45 MP sensor. Wouldn't it make sense that the flagship should have this? My understanding is that since the flagship is for professionals and if they only need that, then the rest of us mere mortals can do just fine with a 20MP sensor as well? I understand a lot has to do with print size or what you intend to do with the pictures, but don't professionals benefit from the bigger sensor as well?