I've just read it an cannot fathom what the problem is. So he is enthusiastic about it? Well, that's hardly surprising considering the huge fanfare associated with the 36 MP D800 only 18 months ago. Now we have a similar sensor in a body about the same size as a Leica M and over 100g lighter, with interchangeable lenses and the ability to take many third party lenses... and at a lower price than a D800 body.
Its a huge achievement.