I also updated all my iOS(8.3) devices with the final release iCloud Photo Library as well as Yosemite(10.10.3) Photos app. Everything was going fine while my iPad, iPhone and Mac were all uploading pics and vids to my iCloud library until I noticed on my iPhone 6, after uploading/updating several thousands pics/vids, it basically stopped at about 1100+. It keeps saying it is "uploading" but nothing is happening and nothing is being updated on my iPad. And then I noticed that 5 items are being uploaded on my Mac but again nothing is happening. The pics/vids numbers "match" on my iPad and iPhone (which makes no sense since iPhone has more pics to upload), but they do not match my Mac and all of which DO NOT match iCloud.com Photos. Both my Mac and iPhone continue to say uploading without anything actually happening.
I am worried about turning off and on the photo library setting on my iPhone because it is warning me that all the originals are not on the phone and will be removed (since i had optimized option set). I am also unsure that if I did do that, would actually help and continue the uploads.
Ive been reading that they just keep saying wait and wait for it to do its thing and it will get done but in a final release should it take hours or days for it to complete? Especially when the first 3000+ items were so quick to upload.