I want to keep things realistic about what you might get from projection regarding black levels.
I think the typical "videophile" environment tends to lend flat panels a bit of an advantage in some ways. Most...I think...don't watch in complete darkness, but rather in lower light levels, with care that no light shines directly on the screen. Not watching in pitch darkness allows our eyes to be biased slightly so that the black levels of the flat panel aren't competing with a super black surrounding, so they look very dark. As I said earlier, even my Samsung LCD panel looks like it has dark blacks under carefully controlled lighting. It's only when I turn the lights completely off that
the black levels become obviously too light.
The thing with projection, then, is that since it's a "lights out" viewing environment, it means you are always watching under the most challenging conditions regarding black levels. Any black areas not perfectly black in the image will be more obvious in that case. Also, some of us have surrounded our projected images in black, and made our room decor particularly dark and non-reflective. These conditions make it very easy to detect any glow to black levels.
The JVC projectors, currently the contrast/black level kings in projection. I'm amazed at how dark my JVC projector can project, especially with the Dynamic Iris engaged. However, the conditions under which I watch it also make it clear we still have a ways to go before seeing pure black on screen in projection. Unless you have been watching your Kuro in pitch black, you may be used to a subjective impression of black levels that seem pure, pitch black, and if in reading about the JVC's measurements you think you will perceive the JVC's black floor as even darker, I'm saying that might not be the case.
There's also another phenomenon I've noticed in projection that makes it challenging for black levels: the larger I make the image, the more I notice higher black levels. I use a set up where I'm zooming the image to various sizes all the time, so I really notice this. Say I put on a movie with lots of dark areas in the image, like BladeRunner. I start by projecting it at (using a 16:9 screen) 102" diagonal. That gives the image a width of around 89 inches.
Then I zoom it out much larger to 125 inches wide. The zoomed out image is going to be dimmer, and hence the black levels will go objectively deeper. But it doesn't necessarily look that way. In fact I can start to notice the "less than black levels" on the larger image more. I believe several issues are at play: The smaller image looks more contrasty, more punchy, because it is brighter. The brighter parts of the image bias the eye a bit to make the darker parts look darker next to them. Further, the image being smaller places all that visual information, the bright and dark areas of the image, in a smaller space in your viewing angle, so in that sense the bright and dark areas are "closer together" which means the bright areas keep your eye biased to see the dark areas as darker - the contrast effect. Upon making the image larger, now those dark areas take up much more visual space, the bright area of the image is now more distant from the dark parts, and I can "see into" the larger dark areas better to detect
it's not pitch black...even though in measurement terms the larger projected image actually has deeper black levels.
There's also issues like the fact that the contrast is measurably better depending on what zoom setting you are at with your lens - generally more contrast zoomed smaller, less zoomed larger. Plus, projector light output isn't linear as you zoom out the image. But it's my hunch that the other variables I'm discussing above play more part in what I'm describing.
In a nutshell: there are tons of variables at play in how you will actually perceive the black levels of a projector, and the above is only a partial discussion.
All that said, whether you end up perceiving the projector black levels as deep as your Kuro or not, the black levels possible from the JVC are fantastic, and the contrast is superb. Once you have contrast this good, the size disparity between the projected image and the flat panel really rules the day. My 42" original Panasonic plasma used to seem huge to me when it replaced my 27" CRT years ago, now it feels like I need binoculars to watch something on it, compared to my projection set up. The experience of projection is just a different animal.
My family watched the Blu-Ray of the movie Speed last night at about 116" wide and the depth to the image was so life-like, the sense of seeing out past characters to backgrounds and horizons, the sense of palpable space, is something that you more easily experience from good projection. It's why people using projectors often describe it as being more like being "in the movie" than just watching TV.