Live view on a IQ can work, but I have found that as the others posted, it's conditions are very limited.
If you are outdoors in any type of light, then you will need to stop down the lens and possibly add a ND 16 just to get the screen
to where you can view it without massive amounts of blooming. Of course if your lens has any type of focus shift which a few of the
Schneider and Rodenstocks do, (especially the older non HR series), then there is no point as what you get in live view will not be
the same.
Even indoors live view is pretty worthless. It takes way to long to adjust, blooms and just eats up a battery. The only time I use it
is if I am working on a subject that may be within 15 feet or so.
Since I moved over to a tech camera, I also use a laser rangefinder, Not a distro, but a much cheaper but just as accurate Opti-Logic brand.
insight 400 XT. great range and dead on accurate, 15 feet to 1200 feet.
The IQ screen will easily confirm focus when viewed at 100%, either by use of the focus mask, or just viewing. It's so quick now with the
latest firmware to zoom in, 100%, spot your corners, and center, verify focus and shoot.
I don't think Phase will have a work able practical live solution until they move to CMOS, and not sure when or if they plan to.
Paul