hifiaudio2, to evaluate CA I recommend using a crosshatch test pattern, if you have one. I don't have DVE, but Avia has a grid pattern of widely spaced white lines on a black background. CA will show up as magenta or green fringing on the lines. I would expect a misalignment of the 3 devices to show similar fringing across the whole pattern. On the other hand, CA, which is an optical flaw, will get worse as you go farther from the center, and will be symmetric, meaning the green fringe will always be hanging off the side of the line towards the center.
If you're close to the set you can also see the effect on shots with white titles on dark backgrounds.
I'm interested to hear any results, because I had and returned a 52Z575, and the CA was a big reason. In practice, I would very rarely see the color fringing from a viewing distance of 10', but I felt that the focus of the image was bad ourside the center part of the screen, and it stands to reason that the CA was to blame. I saw varying degrees of CA in a least 5 different sets in the stores, so I didn't bother trying a second JVC (ended up with the Sony 55WF655). With the same pattern I could detect no CA on my Sony or a previous Mits DLP.
Note also that on the x75 sets you can adjust the alighment of the panels in whole pixel increments via the service menu. In case you run into this problem, you'd figure similiar adjustments would be available on the new sets.