I just added the 135mm f/1.8 GM to my collection, my favorite focal length for portraiture. When I used to shoot micro four-thirds, my go-to was the Olympus 75mm f/1.8, still among the sweetest lenses in their lineup., as well as being an outstanding value. Best of all, I snatched the GM for $500.00 less than the going price in the States and they even threw in complimentary Peak Design strap worth $65.00. Mounted on the a7 III is the 20mm f/1.8 G, one of the sharpest lenses I’ve ever had the pleasure of shooting with.
The Daejeon Chronicles 
Got this Peak Design width strap 3 weeks ago. It’s good for heavy lenses but it takes a lot of space in the bag.
The 135 f1.8 will be a good autofocus challenge for your future Sony A7SIII !
The tracking autofocus triggered by touching a target on the screen is very interesting.
What is also smart is: by the time the target is coming to the camera, the autofocus detects that there’s a person’s face and then eyes in the target.
Yeah, I think having video eye AF is going to be really critical with a lens like the 135 GM! For now, I’ll have to use it on sticks, since I don’t have a strong enough gimbal.
I see.
I have a Zhyiun Crane Plus (2.5 kgs maximum) and the results are not so great with a heavy lens like the Fuji 16-55 2.8
The Ronin S may be better but it’s a bit heavy.