Been following the discussion on A7 III vs A9, I’ve owned both but for me the sweet spot is the A7R III, widely regarded as the best sensor Sony have produced when considering IQ/performance/ value for money. I can see a clear advantage in IQ but would go back to an A9 if I needed to shoot fast moving action or BIF.
Interesting take I have had all 3 of these as well still have a couple of A7III's and A9's.
Thought the A7RIII was a complete dog of a camera personally, it has a nice sensor but a.f isn't great and purely for my purposes it didn't suit my needs at all. For someone that maybe just shoots landscapes or stuff that doesn't move the A7RIII might still be a good option as the sensor is good. Although to be fair you might as well just get an A7RII then as its the same sensor.
At the moment between the 2 of us we have:
A9II
A9 x 2
A7RIV
A7IV x 2
A7III X 2
Of those for us anyway the A9 is my favourite, for me the A9II is just the same thing with slightly different ergonomics. The A9 being a fair bit cheaper is much better value, I should never have bought the A9II, the ergonomics difference means nothing to me.
Even with all the different options available now the A9 is still a great choice especially at what they can be bought for now used.
A9 has better A.F than the A7RIV, A7III and equivalent A.F to the A7IV. The blackout free shooting is a good advantage over those as well. The ability to use the silent shutter all the time is also a huge advantage. Each of my A9's have less than a couple of hundred actuations because we never need to use the mechanical shutter. We always set the other camera's up when we need to use flash. It is just handier for us to have a camera ready to go with a flash and others without.
Yeah the A9 doesn't have the dynamic range of the others, but have honestly never once found that to be an issue in real life situations, the difference is very small.
24Mpx is also no issues for what we need either, although a little more would be nice.
In an ideal world I would like a 33-36mpx A9III with the viewfinder from the A7RIV and an upgraded L.C.D and the option to use the newer faster cards. That would be the perfect camera for me. Although rumours suggest the A9III will still have a 24mpx sensor.
Everyone's usage will be different for a hobbyist that shoots a lot of different things. I guess the A7III probably makes the most sense as a do all camera. The A7IV is better at everything but is a fair bit more expensive and has the flip out screen which I personally dislike.
The A1 is the interesting one I guess as it has the best of everything but 50mpx is too much for me and for the price of an A1 I can have an A9 and an A7RIV which makes a lot more sense to me.