Positives:
-Satisfactory build quality, sturdy body and claims weather sealing. It's not top-notch in this area (like Canon 5DmIV, for example), but probably okay.
-Small size, especially considering we're talking about a Full-Frame sensor with IBIS.
-Very good and fast EVF, with satisfactory resolution.
-Very good performance in low light conditions for the value of the camera.
-Excellent peaking in manual focus.
-There is the option for uncompressed RAW in photography.
-If you shoot RAW, go ahead without worries. But if you shoot JPEG, there are companies with much better color science whose photos will seem much more attractive to you right out of the camera.
-Battery life is satisfactory ONLY IF you put the camera in flight mode (disable WiFi/BT/NFC), otherwise very poor and you definitely need an extra battery.

Negatives:

-I DON'T know what happens in terms of Reliability, because having the camera for less than 5,000 clicks I sent it to Germany to have the board and some buttons replaced!... Note that I am an amateur user and very careful regarding photography and use of the camera.

-The autofocus, although fully satisfactory, struggles a bit in low light conditions and in C-AF.
-The kit lens is ok for general amateur use, but not for more, and the lenses for the E system remain quite expensive.
-The menu is difficult. You will struggle to read the manual thoroughly and map the most frequent functions to the camera's buttons, so you don't have to enter the menu often. The good thing is that the camera is almost fully customizable on its buttons.
-There is no touch screen.
-The video is quite soft, even for 1080p (it doesn't shoot 4k). Its performance in low light is poor. A mid-range smartphone has about similar quality.
-The IBIS is very useful, but it doesn't even come close to the stabilization levels offered by Panasonic & Olympus. This becomes even more apparent in video.
-The package does not include a battery charger, only a transformer for charging the camera (with the battery inside), during which you cannot operate the camera.

At its price, it is the best choice you can make in Full-Frame for this money. Definitely top VFM. Just consider if you NEED a Full-Frame camera or if you prefer a more modern crop-sensor technology.

Personally, I still haven't decided. On the one hand, I enjoy the Dynamic Range and the low light performance, as well as the beautiful bokeh the sensor provides. On the other hand, I miss the "modern conveniences" offered by newer crop-sensor cameras (touch screen, pleasant UI, better AF, more functions [time-lapse, live composite, film simulations, high-res mode, etc.], far better video, etc.).

Alternatives in order of personal preference: Panasonic G9, Fujifilm X-T3, Fujifilm X-T30, Canon M6ii, Nikon Z50. And the closest in price Full-Frame mirrorless, Canon EOS RP.

Positives:
-Satisfactory build quality, sturdy body, and claimed weather sealing. It is not top-notch in this area (like Canon 5DmIV, Pentax K-1, etc.), but it is fine.
-Small size, especially considering it has a Full-Frame sensor with IBIS.
-Very good and fast EVF, with satisfactory resolution.
-Very good performance in low-light conditions (not the best, but definitely sufficient for the camera's value).
-Excellent implementation of peaking in manual focus.
-With the latest updates, there is the possibility of uncompressed RAW in photography (finally!).
-If you shoot RAW, go ahead without fear. But if you shoot JPEG, there are companies with much better color science, and their photos will appear much more attractive right out of the camera.
-The battery life is satisfactory IF you put the camera in flight mode (disable WiFi/BT/NFC). Otherwise, it is very poor. My advice is to make an extra battery your first accessory purchase.

Negatives:
-The relatively small size may not suit all hands, and those who like the handling of classic Full-Frame DSLRs will need to adapt to the more compact grip. My advice is to hold it in your hands before making the purchase.
-The autofocus, although fully satisfactory, struggles a bit in low-light conditions and in C-AF.
-The kit lens is okay for general amateur use, but not for more than that. In general, lenses for the E system remain quite expensive.
-The menu. Unacceptable. My advice is to put in the effort and read the manual thoroughly and map the most frequent functions to the camera's buttons, so you don't have to enter the menu often. Even viewing and zooming in/out on a photo you took is inconvenient. The good thing is that the camera is almost fully customizable with its buttons.
-There is no touch screen.
-The video is quite soft, even for 1080p (it doesn't shoot 4k). Its performance in low-light conditions is poor. A mid-range smartphone has similar quality.
-The IBIS is very useful, but it doesn't come close to the stabilization levels offered by Panasonic & Olympus. This becomes more apparent in video.
-The packaging does not include a battery charger, only a transformer for charging the camera (with the battery inside), during which you cannot handle the camera.

Overall, despite its drawbacks, it is an excellent and reliable proposition considering its very low cost. At its price, it is the best choice you can make for a Full-Frame camera. Definitely top value for money. Just consider whether you NEED a Full-Frame camera or prefer a more modern technology crop-sensor.

Personally, after 6 months of use, I still haven't decided... On one hand, I enjoy the Dynamic Range and performance in low-light, as well as the beautiful bokeh produced by the sensor. On the other hand, I miss the "modern conveniences" offered by newer crop-sensor cameras (touch screen, pleasant UI, better AF, more functions [time-lapse, live composite, film simulations, high-res mode, etc.], significantly better video, etc.).

As alternative suggestions, in order of personal preference, I would recommend the Panasonic G9 (do not underestimate M4/3!), Fujifilm X-T3 & X-H1, Olympus E-M1ii, Fujifilm X-T30, Canon M6ii, Nikon Z50. And the most affordable Full-Frame mirrorless, Canon EOS RP. Good purchases in whatever you decide.

I believe I am the most experienced person to speak about this camera, I have had it for two years and honestly I have shot everything from weddings, baptisms, studio, clubs, portraits, sports, nightlife, landscapes. I have taken over 150,000 clicks in rain, snow, hot sun, colorful parties, on a beach with sand, even soaked in sea water, the camera is a beast.
1. Everything is good, everything is perfect, but after 6400 iso it is not visible, it has a lot of color noise and the colors are distorted, even older cameras like Nikon D750, D610 or Canon 6D, even crops like Nikon D7200 or Canon 80D have better iso, and the worst of all, even the basic A7 has better iso.
2. Autofocus is quite satisfactory, but it doesn't have the same autofocus as the A7R2, avoid adapters with autofocus.
3. Its battery is very good, I have never taken less than 700 photos and with 50 euros you can get two more and be fully covered, even if they are not original, only use an authentic battery grip.
4. I chose this one over the basic A7 because the stabilizer simply allows you to shoot at speeds of 1/10-1/40 handheld and avoid many stops at iso.
5. Satisfactory dynamic range.
6. The most value for money full frame on the market.
7. Very convenient size, I can fit the camera, two lenses, and a flash in a handbag