Vimeo doesn't support 2.5k streaming playback yet so DOWNLOAD THE ORIGINAL FILE!!
You will be amazed at the quality. Check out EOSHD for the full Blackmagic CInema Camera Premiere CS5.5 / CS6 workflow. eoshd.com/content/8822/lossless-blackmagic-cinema-dng-2-5k-workflow-for-adobe-premiere-cs5-5-with-smooth-playback-and-editing
Huge thanks to: John Brawley, KJ Halverson and James Miller.