I don't do much stuff that's as demanding on autofocus as birds in flight or anything, but the 2X III extender works fine on my 5D IV with the 70-200 2.8 IS II. I mean, I can't really tell the extender is in there based on how the camera operates, other than the fact that it zooms further and the aperture only goes down to f5.6.
Pretty safe bet that the high res model will be coming along, but you are absolutely right about the battery life. Mirror box AF sensors use WAY less power than a main sensor plus a display, but there are other tradeoffs. I have a 90D and in SLR mode it is amazingly frugal with the battery. However, in live mode the AF is more accurate and it works well down to at least f/11 and in decent light even f/16 whereas the (very good) OVF is limited to f/8. Live view does suck battery pretty much the same way as a mirrorless so those are the tradeoffs. The 7D II is a very good camera, but the niche it fills uniquely is not a very big part of the market, and that's not to say that folks who didn't NEED one didn't buy one, because they did, but rather to say that the requirement for a 7D that can't be filled by something else is small. For many, the 90D will suffice and it does have noticeably more reach and really decent video. For others, the flexibility of the RF series with the ability to shoot full or crop and offer DPAF with an EVF will be just fine. Note, also that IBIS will make AF even better, since it is easier for the camera to capture an accurate proxy to drive the AF.
His viewpoint is not dissimilar to the worldview on photography during it's onset. Artists and critics in the mid 1800's dismissed it in general and it wasn't until pictorialism style of photography in the late 1800's in which the masses started to accept it as an artform.
It's the same pixel density as D850 which is only slightly less than D500, and IQ in general would be much better than 7DII, losing a little reach is something I cut off my right arm for if these specs are true.
Didn't say was. I said is. And because I suspect there might be a bias means I don't know these photographers? Why not add Ansel to your list--I must be a total noob, huh?
