All cameras are cinematography tools.
The new sensor shoots in 2 forms of raw prores 444 422hq and standard as well as proxy in 4k and 2k. It will also shoot in anamorphic
These are the aspect ratio from the site 4608 x 2592
4096 x 2304 (4K 16:9)
4608 x 1920 (4K 2.4:1)
3840 x 2160 (Ultra HD)
3072 x 2560 (3K Anamorphic)
2048 x 1152 (2K 16:9)
1920 x 1080
Except it does come with the new sensor.
The URSA mini comes in 2 formats, one with the same sensor as the current 4k and one with the new fairchild 4.6k and has a lot of the features including the 15 stops of dynamic range. Out of the the 3 choices at this range ( FS7, Canon C300 mk2) the URSA mini is the cheapest option even kitting out.
The S8 is easily my favorite budget head, far better than the 504hd. The sliders I got to play with at BVE and I can say they are exceptional especially when the flywheel i added.
I own a 5d mk2 and a BM4K and I can say that the BM4K has much better dynamic range than the 5d mk2 when shooting video.