Thanks this is all great and so minor really compared to my Canon gripes:
1. Impossible to see black AF point in dark conditions.
Nikon AF points are red in dark condition.
2. Auto ISO minimum shutter speed is 1/250 (not good for me as I shoot action on aut0 ISO and want it to 1/2000)
Not sure about other models but the D750 allows 1/2000
3. Spot metering applies to centre point only
There are however things I love. Can I do something similar on the Nikon to this?
1. I have my DoF button, which is nest to lens mount on right hand side of camera, set to a hold to change between AFS and AFC. So for example I am shooting the dog with AFS then as soon as it starts moving I just hold the DoF button and I am on AFC mode. Then I release and I am back into AFS, which is my preferred default position. Really handy.
I'd try back button focus.
You stay in AFC mode and you just take your thumb off of the AF-ON button to get single functionality.
If you want to change from AFC to AFS for real though you can press the button in the Middle of the AF controller (bottom of camera, left of mount) and rotate the command dial to move betwen AFC AFS and AFA.
Press the same button and use the sub command dial and it iterates through the various number so sensor points e.g. auto, single, d9 d21, d51, 3d, Gp.
These settings are displayed in the viewfinder so you can make these changes while shooting.
The switch around the button, changes from manual to AF mode.
2. Exposure comp - I just use rear wheel. Can I do this on Nikon? I know it doesn't have a wheel, but can it be done so front dial does aperture, rear dial does exposure comp?
The rear dial is called the command dial and the front one the sub command dial.
The roles of the command dial and sub command dial and be reversed in the custom settings (pencil) menu.
God know why it is a pencil. Nikon designers may know too. I have no clue.
3. Easily changing ISO by pressing centre button of rear wheel and using front dial. Does that button in the middle of the Nikon joystick allow this?
You press the ISO button and turn the command dial.