[Brightcolours]

    Well, yes that's why I can't see great FF AF coverage,...... even the D5, although with slightly larger spread, is limited.

 

    What "was" the "ace hand" of the DSLR beating ML in all ways with AF, will in the end be it's limitation, as I doubt in the near future whether we will ever see a FF DSLR have decent coverage, while the A9 covers over 90% of the frame.

 

   I notice that on the D500 with the Tamron 150-600mm at 600mm the AF struggles on the outer edge upper and lower points to focus at F6.3 where the 500mm F4 doesn't!  No doubt the oblique angle of light at the edges of a FF AF array would aggravate the problem even more if they tried to cover the whole frame, as well as causing edge inaccuracy, something that the APSc format has few problems with.

 

   No doubt that the 6DII beats the D750 in video. But they just wouldn't  give people 4K and when they did in the 5DMK IV it was with motion Jpg just to be awkward, just like the single card slot in the 6DII. (and no headphone socket.....the expression "the halfpenny of tar that sunk the the ship" springs to mind here)

     

   I just don't know why Nikon doesn't get on their case with on sensor PDAF, Canon has such an advance there which could go some of the way to explain Canon's continued lead in the market even in spite of Nikon using Sony's superior sensors. Canon also benefits from their own home grown sensors which gives them the ability to be in total control of their own game.

 

    Either way between Canon and Nikon they both cripple their feature list one way or another.......

 

              Sony must be delighted!

The A9 will struggle in low light, concerning AF. The A9's hocus pocus to get electronic shutter fast enough without global shutter makes for some problematic issues with artificial lighting. All is not rosy in ML land either.

 

The D500 has f5.6 AF points, they can turn partly bling at f6.3, hence the struggling. 

 

I do not know if the 6D mk II gives better video as the D750. For sure, the 6D mk II has better live view, and better live view and video AF. The 5D mk IV's codec is an asset, not an issue. It gives high quality IQ, which was the whole point of "4K".

The 6D is photo camera, not a video camera for professional use. So I do get why they did not bother with a headphone socket, and with 4K (which would need more heat management.. something Sony does not care about). So, I do not see that as a big issue, 4K video for amateurs is just a spec sheet wish.

 

Nikon needs a capable partner to work with closely, concerning live view AF advancements. They do not manufacture their own sensors, they have multiple suppliers for their sensors complicating matters to a very large extent. They have made their 1st baby steps with the 18-55mm lens with stepper motor (like STM from Canon), but lack any camera yet making good use of it.

 

Canon 1st tackled the STM technology in some lenses, improved live view AF routines for them (CD AF in live view) before they started with on sensor PD AF points, after that (sensors with PD AF points) came with dual pixel sensors (making just about every pixel usable for the PD AF stuff). Small steps which by now make a smooth, fast and pretty refined system.

 

I have not seen any CF card or CD card fail, so for me dual card slots is the last thing i'd worry about.