we do the dog and pony show with the lighting gear....

you see a couple elinchrom four foot softboxes, 48-60 inch umbrellas, and a boom stand with gridded barn doored monoblock... snoots, five foot reflectors etc...
people take you seriously...

there have a few times where we set up the lights where we could have done just as well with a reflector and a tripod....

now that I think about it.... the 6x7 would be a better candidate for this frankencamera....
the pentaprism can be popped off and replace with the evf I described above, and the sensor from the 645 fitted at the film plane....

I agree with John...
nice try. lots of potential, but the tripod, sharpness, dof... just the technical aspects can be tweeked to up the game a bit....

you are effective getting into studio shooting here with intent to create salable images.... the technical details will matter more so than for the casual shooter who relies on luck and statistical numbers to get a good shot.

I had some fun a while back using a pan of water and floating the flowers on or in the water and lighting it in a similar fashion to water droplets.... fun for experimenting with btw....

take a 645d... place a second set of kx /k7 electronics inside it... yank out the mirror and replace it with a fixed pellicle mirror, take out the viewfinder screen and pentaprism and replace it with the image sensor from the kx/k7.... use the lcd as part of the evf system....

record video through the evf system to one sd card, and stills through the existing 645d sensor to the 645 sd card slots... simultaneously....

To quote Sodamn Insane: "It would be the Mother of all Evil Cameras!"

try this one for fun...
shoot a flower. print the flower on water color or matte paper. Spray the paper with water from a mister.
use the print you just made as a backdrop, and shoot the same flower again....

oversized lens on a shiftable mount is not complex when using manual focus..... it neeeds to throw a medium format sized circle, but it is doable...

if in the same price range you could afford both.
I'd use Pentax for general use (color consistency reasons) and the samyang for low light video...

I can see it.
Pentax had a 28 mm soft.
starts off soft, gets sharper as you stop it down...
take that and add to it a ball socket design like the lensbababies...
scrap the af, manual only, and you could make it...

wide open with tilt for that miniature toy shot look, or stopped down with shift movements for serious architecture shots...

at those prices I'll stick to photoshop's perspective controls...
now get Pentax to release one at 18mm in the $600-800 price range......
I'll bite....

seriously...
I'm giving serious consideration to a kx or kr just so I can add a few minutes worth of video clips with fisheye, low light shots to a 1.5 to 2 hr multimedia dvd for Wedding clients....
and it is hard to justify that expense...

and that has to pass the accountant for approval and since the accountant is my wife, a bad decision could mean no sex.