For example this one:
Customized Cine Lens Nikon 24 70mm F 2 8g Ed Canon EF for EOS DSLR Cameras Pro | eBay (http://www.ebay.com/itm/Customized-cine-lens-Nikon-24-70mm-f-2-8G-ED-Canon-EF-for-EOS-DSLR-Cameras-Pro-/271285745636?pt=Camera_Lenses&hash=item3f29e3f7e4)

Might get the Nikon mount version and add a metabones Nikon G to Micro4/3 adapter and put it on the Panasonic GH4?

I've heard not so good things about the brand of lens you linked to, mainly the way the housing is attached to the lens and quality of construction...

I have heard some good things about another company, called G.L. Optics. They don't have that 24-70mm though. Either way, try and find some reviews of the rehoused Nikon before you drop that kind of cash.