with a lot of data
--
Good judgment comes from experience
Experience comes from bad judgment
Good thing there is a lot of data. I took a cursory look.
Hearing all the hype I was expecting to be blown away. I was not.
Sure the Sony had slightly better noise and resolution than the X-H1 at ISO 12,800.
So does my 4-year old D750. Both are FF. So it's not exactly a fair comparison.
To my (admittedly untrained eye), the difference is less than a stop, at an ISO that I won't ever shoot at. At lower ISOs, the difference is much less dramatic.
So I'll not be switching systems.
I have recently been heavily considering the switch to the A7iii, because it's the first sony camera that actually seems to be really worth switching to sony for. And it would come with the bonus of having the (approximately) 1 stop better low light / ISO performance.
But then I looked at the LENSES in the sony lineup. I've spent days trying to find a set of lenses that will replace my Fuji setup, and still fit in my camera bag without taking up too much space and bankrupting me in the process.
For a start, there's nothing that can replace the Fuji 18-55 f2.8-4. Nothing. The default sony kit lens is bigger and heavier and *(come back to this later). The other zooms, which are very good, are also huge and expensive.
There's a 55mm 1.8, and a 35mm 2.8, that are smallish and not terribly priced. And a 28mm f2 which seems good too. But here is where we hit the * from before.
* - Aperture. The kit lens is 3.5-5.6, so a stop or more slower than the Fuji kit. The primes are 1.8 at best, 2.8 at worst. If you go for the older Fuji primes, you get f1.4 on both the 35mm and 50mm equivs without breaking the bank. So you gain back half a stop, or even 2 stops, of the disadvantage of APSC. You can shoot at ISO 3200 while a budget-minded sony shooter will be on 6400 or 12800.
This was my working. Only really works for me I'm sure. If you push the budget more, you can get 1.8 lenses for a lot of the primes, maybe even a couple 1.4s, and so will out-perform Fuji again. But from what I can find, it will cost a lot to get that.
So yeh, Fuji loses 1 stop (more or less) in ISO noise, but gains 0.5-1.5 stops from their 'budget' lens options.
Aside: Does Fuji have faster lenses for more money? I know Voigtlander does some 0.95's for M43, hadn't noticed anything for APSC though. f1.4 is fast enough for me I'm sure, I have the 35mm and I'm considering the 23mm too. Though the new weathersealed f2's are tempting too.