I pre-ordered a D5 and later cancelled the order after taking too much notice of all the initial reviews.
I have now bought the D5 after getting over my initial concerns and can say from 2 months usage that it is a fabulous camera.
The AF is a massive "step change" over the D4s and the 9 point dynamic area mode AF mode is excellent for my uses. The extra 25% increase in sensor size is most welcome and the initial concerns over low ISO DR have not been a problem for me so far, a week in Scotland in 3 weeks time will be a full testing experience for the 5.
I have used all my 4 zoom lenses over a range of 16-400mm on the camera and have not had any problems.
In summary a delightful improvement, a larger sensor D5X? would be most welcome if Nikon read our threads!