Sony FE PZ 28-135mm f/4 G OSS Lens Kit with Chiaro 95mm UV Filter

It is best to use the lens support to mount to the tripod since this will give the setup the right amount of height clearance without damaging the lens.

Yes, The Sony FE PZ 28-135mm f/4 G OSS Lens is full frame and would support Sony E-mount cameras like the Sony A7IV.

Unfortunately, I have not seen any side-by-side comparisons between the Sony FE PZ 28-135mm f/4 G OSS Lens, which is one of Sony's cine lenses designed primarily for their video cameras, versus their Sony FE 135mm f/1.8 GM Lens, which is a lens designed primarily for still photography usage. That being said, simply making an educated guess based on the series of the lenses, Sony's G-Master (GM) lenses are touted by Sony as being their highest quality premier optics for still photography usage, and their G-series lenses would be right below the GM-series lenses as their next-best high-quality optics. Also, prime lenses with a single focal length tend to generally out-perform zoom lenses with varying focal lengths. As such, while I have not seen any side-by-side optical performance testing of these two lenses, simply judging by the lens' series and the prime vs. zoom focal lengths, I would lean towards the Sony FE 135mm f/1.8 GM Lens as being the optically superior lens.

Yes it is.

This cannot be used on and R5. We are not aware of anyway to adapt it.

The most recent one is the Sony FE C 16-35mm T3.1 G E-Mount Lens. https://www.bhphotovideo.com/c/product/1506716-REG/sony_selc1635g_fe_c_16_35mm_t_3_1.html

No, you do not need additional attachments. The Sony FE PZ 28-135mm f/4 G OSS Lens Kit with Chiaro 95mm UV Filter natively works with Sony FX6 Full-Frame Cinema Camera (Body Only) zoom toggles.

The Sony FE PZ 28-135mm f/4 G OSS Lens Kit with Chiaro 95mm UV Filter does communicate with the zoom control on the Sony FX6 Full-Frame Cinema Camera (Body Only).