I've spent the past couple days messing around with iCloud photo library and discovered an oddity this morning. When I configured iCloud photo library on my phone, I set it up with the "download and keep originals" option. I assumed that when my photos were uploaded to iCloud, they would be uploaded at their full resolution, which would then allow me to pull photos from the iCloud.com website (Since there is no OSX app for photos)...... I assumed wrong... I tested this by taking a photo with my phone (5 minutes ago) and ensuring it was uploaded to both iCloud and OneDrive. I then went on the iCloud and OneDrive websites and downloaded the photo to my computer. I was shocked to see that the photo in iCloud downloaded at 820kb with a resolution of 2048x1536. The EXACT SAME photo downloaded from my OneDrive account comes in at 1,796KB and a resolution of 3264x2448 Morale of the story?? It appears that iCloud is NOT storing full resolution photos (unless I am totally doing something wrong). Go ahead and test for yourself!