I have in my possession the prototype Focus Optics Ruby, 14-24mm T2.8 lens.
I have been consulting on the development of this zoom which is a rehousing of the fabulous Nikon 14-24mm F2.8 AF-S G still lens. Being a prototype I'm not going to go into too much detail about the unfinished mechanics, but I will say that the focus (which has been corrected to turn in the proper cinema direction) is buttery smooth and precise.
The lens it's self has an amazing 3D quality to it that makes eye focusing literally a snap. I think this is because of how unbelievably sharp the Nikon optics are. This lens was developed for Nikons flagship 24MP D3x camera and delivers astounding detail and distortion correction for such a wide lens let alone a zoom. From what I'm seeing I believe this lens will be able to punch it's weight with the RPPs and Master Primes no problem. In fact it's so well corrected that you sometimes forget you have such a wide lens on. As far as I can tell there is no discernible sharpness difference stopping down.
Here's a frame grab from some testing with my most compliant subject...
I'll be shooting a PSA tomorrow and using this prototype for the wide steadicam shots, I'll post what I can tomorrow evening.
In the mean time here's a 1080P H.246 clip for fun...(54MB Ctrl./left click to download)