Recently while in Iceland, I shot some short videos of Gullfoss on the Hvítá river. These were made handheld with a Canon 5D III and Zeiss Distagon 21mm f/2 combo. No external mic. No post-process editing. Just straight 1920 x 1080 HD 29.970 fps .mov from the camera > imported to Lightroom 5 > opened in HandBrake for H.264 .mp4 encoding > uploaded to YouTube. Depending upon your browsing bandwidth, YouTube will down-throttle the videos' native resolution to <720p mush. Just pause the video, rewind to the beginning, and toggle the quality settings' gear at the bottom right of the YouTube taskbar to 720p or full 1080p if you want to watch these in full-screen mode.
And here's one from the outcrop at the top of the falls: