I've only had a chance to look at the UHD disc so far, but I don't know that I like this new release.
The examples people have been posting here from Blu-ray.com must have been taken from the regular Blu-ray and not the UHD disc.
New:
Old:
So anyone that couldn't stand the green tint (like me), can now watch this movie in a decent fashion. The UHD also comes with a regular blu-ray that has the remastered picture, thankfully.
It is less green now, but this is how that shot looks on the UHD disc:
http://www.screenshotcomparison.com/comparison/114216
Not a dramatic difference.
My problem is that there's hardly any blue in the movie at all now - whether in the real world or the matrix. Both locations have a deep cyan cast over the blues and in the shadows.
And skintones are looking very pink in a lot of the scenes. It's not as dramatic, but a lot of it makes me think of the cyan/magenta tinted shots at the beginning of
The Aviator.
http://www.screenshotcomparison.com/comparison/114215
I've also noticed that shadows seemed to be clipped in some scenes.
On a positive note, the transfer is a lot more detailed, and many of the shots are an absolute improvement over the HD-DVD/Blu-ray release.
Looking back at it - and without an original DVD for reference - I think the issues with color grading on the HD-DVD/Blu-ray release were not as bad as people made them out to be.
You don't have to worry about the highlight detail being missing from the UHD disc
It's mastered for 1000 nits, so as I speculated, it's the conversion from HDR to SDR that has rolled-off/clipped the highlights in this shot.
Here's a comparison with the UHD conversion set for 1000 nits.
This will appear
much darker than it would on an HDR display, but it shows that the highlight detail is present:
http://www.screenshotcomparison.com/comparison/114218