Went from D850 to A7iii. No regrets. Occasionally miss being able to heavy crop, but that is much better cured by a longer zoom than on the PC. Reach currently limited to 24-105mm f/4.
Focussing is VERY fast, EVF is fine (rather than great), eye focussing is superb. If you have decent battery life now, you'll need a spare battery or two, not because it's bad, it's just not as good as you'll be used to.
At the time (six months ago) I did wonder if Nikon's Z6/7 would make me regret leaping over to Sony....should I have waited? Can honestly say I'm glad I didn't wait. The Z6/7 look good, but I can't say either look better than the A7III, let alone the A7RIII.
We'll have to see what the comparison reviews say when they hit YouTube, but for the moment the spec sheet doesn't blow me away. For me at least, Canon was never on my short list so their Mirrorless release passes me by...although I do note the lack of IBS on the spec sheet.
The ability to crop more heavily if need be would be nice, and the better EVF in the A7R III are two things which are weighing more heavily in terms of my interest in that camera vs the A7III. Only when I finally get into a camera store that has both available for me to handle and to compare in person will I finally make up my mind. I'm the kind of person who always gets at least one spare battery at the time of purchase, and also an external battery charger if one doesn't come with the camera itself. (The provided external charger = another plus for the A7R III vs the A7III, although certainly not a deal-breaker.)
At least I have no difficulty in deciding on which lenses with which to start out: Sony's 90mm FE macro and the FE 24-105mm, plus maybe the Sony 50mm macro in addition (can you tell I'm interested in macro?!).
As a long-time Nikon user I was curious about what Nikon was planning to offer in mirrorless, and now that I've seen the specs and read the various comments, I am not interested nor excited. It seems rather disappointing news, overall, and that is too bad for the many who had been eagerly anticipating the Z series cameras. I've never used Canon so the news about them also planning to release a mirrorless camera and lenses hasn't interested me at all.
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Just a thought.
Doesn't mean anything...
Years and years ago I remember seeing an article about SONY's "first digital camera" -- called the "Mavica" (sp?).
It was very primitive, b&w only, and had the resolution that was probably equivalent to a vacuum-tube tv screen of the time, if that good.
But... I was talking to a friend, and told him, to wit, "this may look primitive now, but it's going to be the end of film photography". Not immediately, but "in time".
And although there are still film cameras left, and still some folks who use them, digital -did- spell "the end" for the paradigm of film-based photography.
Today, looking at the rash of "mirrorless" introductions (Nikon, Canon, Panasonic not far behind), we can pretty much see "the end of mirror-based cameras".
They won't completely disappear -- not yet, and some people will continue to use them for many years.
But the "advent of good mirrorless" is going to brush aside mirrored cameras, both at the amateur/enthusiast level, and eventually at the pro level as well.
Perhaps quicker than we might expect...
I remember the Sony Mavica series!! It was the one which used a CD as its memory/storage media and was large and bulky. That was back in the days of Usenet and the various alt.rec.photo discussion boards......