Today, Vimeo is launching 4K video support—sort of. Pro subscribers will now be able to offer 4K downloads of their videos. (They have to be 4K videos to begin with, duh.) 4K streaming is "in the works," according to Vimeo, but there are no concrete plans to launch a streaming option at this time.
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I have to jump through hoops just to get 1080p streaming... I like Vimeo for my personal film stuff, but a lot of times with clients, I just go to YouTube. Unlisted links with no password is simple, plays on anything, no upload limits.