Get the DJI RS 4.

DJI RS 4 Mini is a good choice. https://www.bhphotovideo.com/c/search?Ntt=DJI+Stabilizer+Panasonic+Intelligent+Briefcase&BI=8941&KBID=10361&SID=12345&DFF=d50

Like someone mentioned, balancing a rigged Sony FX3 is quite a technical challenge. i have been dealing with the exact same weight distribution issues lately, and it is honestly difficult to find a stabilizer that maintains consistent reliability under a heavy load. I have been very satisfied with the following units for my professional projects:

• Zhiyun Crane 3S features a much higher payload capacity than standard handheld gimbals. It works well for rigged setups because the modular design allows for larger camera bodies and heavier glass.
• Manfrotto MVG460 Professional 3-Axis Gimbal provides excellent stability for setups weighing up to 4.6kg. It is a robust option that I have found very reliable for cinematic productions. Basically, i decided to invest in higher-capacity hardware to avoid motor strain. It provides a lot of peace of mind when you dont have to worry about your gimbal failing in the middle of a take... definitely a solid way to go.

Any updates on this?

I have been very satisfied with how the FX3 handles on various sets, though seeing all these high-tech options reminds me of a much messier DIY project from back in the day. Sometimes the gear hunt gets so intense that you lose sight of the basics. It actually reminds me of my uncle who was convinced he could save a few thousand dollars by building a custom stabilizer for his setup. He spent weeks in his garage trying to engineer a counterweight system from scratch using random hardware store parts:

• scrap aluminum tubing
• heavy duty bungee cords
• old bicycle handlebar grips
• a bucket of lead fishing weights He actually managed to get it balanced once, but the moment he tried a simple walking shot, the whole thing snapped and nearly took out a lighting rig. It turned into a massive ordeal that cost him more in repairs than a real stabilizer would have. But yeah, just thought I would share that since it came to mind.

Basically, the previous suggestions cover the lighter side of the spectrum, but I’d be cautious if you’re actually rigging up your Sony FX3 for pro work. Ngl, while the Mini or the standard version are fine for bare-bones setups, they can struggle once you add a cage, a V-mount plate, or heavy glass like the 24-70mm GM. Imo, you should definately look at the DJI RS 4 Pro for the extra motor torque. When you're on a long shoot, reliability is everything, and you don't want your motors overheating because the payload is redlined. The Pro version gives you that safety margin so the stabilization stays buttery smooth even with a front-heavy cine lens. Plus, the carbon fiber build keeps the weight manageable while maintaining structural integrity. Another solid option for reliability is the Zhiyun Crane 4. It has built-in balance indicators which are a lifesaver for making sure you aren't stressing the motors. If you're serious about the "cinematic" side, honestly, don't skimp on the payload capacity—it’s better to have more power than you need than to have a gimbal fail you mid-take.