For a while Vimeo has been the best choice for the serious videographer, while YouTube is great for "how-to" tutorials, unboxing and cute cat videos. Vimeo has always been better at encoding video (especially for PRO users) than YT, but starting this month, the gap is now expanding even further. From Vimeo's staff blog: "While downloads of 4K source files were always available, we're transcoding in 4K now and allowing downloads of those transcodes. In other words, PRO users upload in 4K and we transcode the video into 4K - and the 4K videos you upload now will be ready when we enable 4K playback on-site." So if you are serious about your 4K (UHD and HD) video, use Vimeo. And forget all about trying to show what the quality of your hd vid is like on Facebook - they don't give a damn about your photos/video and compresses them to death leaving users with the most terrible quality. And on Vimeo you don't need to waste minutes on waiting to click "Skip this Ad" - There are none...! Maybe you don't have a 4K monitor yet, but 4K gives you the better edition options (cropping, stabilizing etc.) AND your files are future proof, so a 1080p project can easily be upgraded to a 4K project in a few years when it's more relevant. Can't wait to watch a bunch of high quality 4K aerials on my iMac 5K. What do you think?