Originally Posted by curtisb
If you want it at UHD resolution in your UV and MA locker, the Sony site is the place to do it since VUDU has stopped syncing UV code redemptions on the MA site to UV. Since it gives you UHD UV license on the Sony store and VUDU supports it at UHD, redeeming it at Sony will sync to VUDU which will then sync to MA (assuming you have them all linked) and give you UHD at all locations.
This may not hold true for the next Sony title. Any title VUDU doesn't have in UHD shouldn't be redeemed at a UV site at this time (you should probably just sit on any of those codes for a while).
Specifically for Sony titles, with primary 4K viewing via AppleTV:
I'm starting to think that redeeming via MA might be the best solution. Yes, I got burned on OG Underworld, but I realize now that's mainly because the UHD code I was redeeming the Theatrical version into UV, and iTunes only has the Extended cut, so it doesn't see anything to port over from my UV locker.
If we think UV might eventually go away, locking in your entitlement there might not do you any good? But redeeming via MA might hang onto your 4K rights, even if VUDU doesn't currently have it? What we'd need to test is a Sony 4K title redeemed via MA, that VUDU doesn't yet have in UHD. Then VUDU offers in UHD, we'd have to see if it showed up in 4K via iTunes. We do now know that MA won't pass these rights back into UV, and sure enough, this movie is nowhere to be found in my UV locker.
EDIT: Success! I just redeemed Starship Troopers (Sony title) UHD code from disc, directly via MA iOS app. VUDU doesn't have UHD rights, yet AppleTV 4K reports 4K!
Unfortunately some of my previously redeemed 4K titles are still "stuck" in UV. Even though they have proper UHD entitlement, VUDU won't pass that to MA
I'm unsure on what would happen if I tried to redeem a new code for one of my existing UV UHD titles via the MA app?