Barry- Thanks for your opinion. You gave me some things to check out, the FE lens vs E lens. The specks I saw state e mount, but there are a collection of weather proof versions of what I have which have been released for the a6300 weather proof body. I have the 16mm, the 18-55mm and the 18-210mm. Only the 18-210mm supports OIS. I also have the .75 and .5 wide angle adapters for the 16mm lenses. The OIS in the ax53 is much superior to the a6300 with a walking video.
Note- I did all my comparison videos of the two on my 4K projector with You Tube 4K video setting. There are quite a few 4K sample shoots for both the a6300 and the ax53.
One thing to note- the 120 fps is only available at 1080p. 4K is 24p and 30p only for both cameras.
Ultimately, I will probably get both models, and two of the a6300's or maybe by then the next version of it. I'm waiting to see how you do, Tom with your work with the GH1 cameras, especially your ability to sync the frames, although my work with twin still cameras in video mode will be mostly what I have been doing with the NEX5n's but shooting in 4K as opposed tom 2K. Thast is static no movement large landscape scenes. Later this week, I plan to review your work, Tom, on my projector 92" wide screen.
I should note that I have been having some difficulty with running the projector in any SBS or Top Bottom mode with the HDMI#2
input that is needed for 4K signals. The signal must be frame packed. When selecting HDMI input #2
on the projector so I can feed it a 4K HDCP2.2 signal, all the SBS and TB settings disappear from the menu. In HDMI #1
input, the SBS and TB is there but the input signal is limited to 1080p60 or less. Then the 3D is upscaled to 4K using Sony Reality Creation which is quite a bit more than just pixel duplication. If the source has the meta data to switch the projector to 4K frame packed than I think it will work.
So, with that said, my main use for 4K right now will be a basic video camcorder to shoot my travel work. Because of that I am leaning very heavily toward the camcorder for the first buy. 20x Zoom, double OIS and digital IS built in is claimed to be the best in the industry now. audio is 5.0 and the camcorder is small enough to carry in a single lens case on my belt.
You mentioned the Gimbal stabilizer. These are good for single and twin GoPro cameras only WRT weight, so no medium format camera will balance well anyway. I don't see using the a6300 handheld except when I have the 18-210mm with OIS mounted.
I'd stick to the GoPro's for 4K but the mandatory wide lens by default is way too much curvature, barrel distortion. I'm basically done with GoPro. They saturated the sport camera market and now the sales is down the toilet. If the drone is a failure, the company will be bankrupt. They already announced it won't be ready this year and they laid off 7% of the R&D staff. It's not good.