Panasonic Lumix S PRO 16-35mm f/4 Lens

I'm no camera expert but I've been using Panasonic micro 4/3 cameras for a long time for my work that requires me to film decent vids. All were pretty great but I always wanted real autofocus and all the great things that come with a full frame sensor. With the S5II is looks like I will finally get everything I need for the video work I do with minimal compromises. I'll even get a solid camera for when I take photos for fun. While waiting for the S5II to arrive I rented an S5 to test the16-35mm f4 that I bought for it. I was hoping the S5II with the 16-35mm would be the only lens I need as the zoom range and constant aperture is perfect for my small studio. I have to bump the ISO up higher than I would like to get the right exposure with f4. I also found that the S5's dual native ISO isn't as good at the high end so bumping it up isn't as clean as the native. I heard that the dual native ISO is better with the S5II vs. the S5 so this might not be an issue anymore but I might have to get a brighter light which could be costly. I can't really fault this lens for all this though. I tested the A7 IV and A7 SIII with the Sony 16-35mm f2.8. That had the light and zoom range I needed. However the A7 IV overheated all the time. The A7S III was better but I didn't totally trust it to film all day after the A7 IV issues which I often need to do. Neither Sony had all the cool vid features I'm used to with Panasonic and it was harder to color grade. I kept making mistakes I wouldn't with Panasonic like when I had Angle/ISO and better monitor support, easier customization etc. Other than great autofocus everything was more difficult. I realized that for me, Panasonic is the way to go for video. I'm also partial to their image quality/color science now after being exposed to it daily for 7+ years now. I love how the 16-35mm Pro with the S5 vs. my GH6 and 10-25mm f1.7 is soo much smaller and lighter. I also have a much better zoom range for what I need as the 10-25 m43 wasn't wide enough and I had to buy a 9mm f1.7 to get what I needed in my small studio. The vids 4k vs. 4k have much more detail with the S5/16-35mm vs. my GH6/9mm/10-25mm combo. It also is much sharper than the 20-60mm Kit lens I rented too. The zoom ring was smoother too. I hope Panasonic quickly adds more lenses to their line. The autofocus tests with Sigma L-Mounts and the S5II look promising. I would love to see something like a Sigma 18-35 because the 14-24 and 16-28mm f2.8's just don't have the zoom range I need. Coming from all the native glass options with M43 to L-Mount is going to be a little more challenging but because Panasonic made the S5II with almost everything I want from a vid camera I'll semi-patiently wait for them to fill out the line.