Archibald wrote in post #18785527
I have the 7D2, 100-400mm II and 1.4X III and enjoy these greatly. Like you I shoot a lot of birds. This combo works great for that.
But this gear is heavy and after a few days of shooting with it, I tend to get a backache. Even if I don't get to the point where my back complains, a day of shooting with the 7D2/100-400II is tiring for me.
With this in mind, I bought the Sony RX10 IV about a month ago. It is actually a fairly big camera and is heavy for its size. But it is a lot lighter than the 7D2/100-400II.
I haven't had the opportunity to explore the new camera as much as I would want, but I have some initial impressions. The first is that the results are not that great in poor light, because that forces you to higher ISOs. At those higher ISOs, especially if you have to crop, the IQ can fall apart. On the other hand, in good light, the camera makes great pics. It is very good at tracking birds in flight.
The menu system is famously dumb. But I deal with that by writing down the settings I need for different situations together with exactly where to find each of the relevant settings.
The silent shutter and lack of viewfinder blackout is a great advantage when doing continuous shooting.
Cropping can lose IQ fast if you are not at the lowest ISOs, a result of the small sensor. (BTW, the so-called 1-inch sensor is only 1/2 inch wide.)
Exposure control and auto white balance do not work as dependably with the RX10 IV as I am used to with Canon. I find that a bit odd because I would have thought that Sony would have figured out better algorithms for this. On the other hand, I am amazed at how well Canon does this. Anyway, white balance is easy to fix in post if you shoot raw. Under- and over-exposure is not always so easy to fix without losing some IQ.
The RX10 IV sometimes exhibits flare, and it can be bad if there is a lot of bright light outside the frame. I've noticed this when shooting at the full 600mm equiv. I attribute the flare to the wide angle lens shade, which is not very good at blocking stray light when shooting tele.
I don't know if you do macro, but I figured out a way to do macro with it. It seems to work well. So far I don't have much experience with that, though, because of the lack of subjects here (being it is winter).
Besides being great for BIFs in good light, the camera is very versatile and is a great vacation camera.
I will be doing a photo trip soon and will take the 7D2 combo as my main gear, because it gives better results than the RX10 IV. But I will take the RX10 as a backup and for casual shooting, and in case the 7D2 becomes too tiring.