[Brightcolours]

 So  it looks like it's maybe 12 frame per sec. is hitting the practical ceiling for mirror and shutter activations together  (more ammo for mirror-less supporters?)........ the shutter just being able to shoot a couple of frames faster.....

    A shame in my view that the sensor isn't 24 Mps as it means the D750 will produce more detailed images for a fraction of the price,  Nikon wants you buy the D750/D810 as a backup.....

 

   ...Great no nonsense buffer and bags of AF points and touchscreen and 4K.....

 

    ....Do pros ask Nikon for longer exposures than 30 secs? ......time's money..     

 

  All in all I can't see an awful lot of attraction over the D4S...........it would be a darn sight more economic to keep the D4S and buy  another cheaper camera for 4K!

There is a practical ceiling to FPS with AF with mirrorless cameras too.... The only one who succeeded bettering the supposed D5 and the 1D-X is the Samsung NX1 (which has been discontinued  :wacko: ).

 

The difference between 24 and 20.8 mp is really quite marginal. The difference between the D4's 16mp and this 20.8mp is larger, resolution wise.

 

The improved AF (taking the claim for improved AF on face value) should be worth the upgrade for many pros, it may bring it to or past 1D-X level.