Do you focus stack? If so, have you seen the automated focus shifting feature for macro photography?
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It's worth mentioning that the AF sensitivity (-4EV) and the better AF point spread are the more important part of the new AF module to me but I'll take any improvement in C-AF too although I don't typically shoot sports or BIF.
And don't get me wrong, I would love having more pixels. I'd be almost doubling my resolution going from D700-D850.
But there are a host of things required to make the most of those extra pixels, otherwise they are just a liability in processing. Speaking of which, my computer is older than my D700 and also needs an upgrade soon.
Most of all I would need to improve my own shot discipline. But the EFC and silent modes will help when shutter speeds reach those critical hand-holdable levels.
I've also chosen to upgrade my glass first, having bought the 105/1.4 and 70-200/2.8FL. 28/1.4E is next on the list. All of these should make the most of the extra pixels.
So yea, extra pixels are great but I want to make sure I can make use of it.