Not really since You Tube and Vimeo are supporting 4K viewing. Now all you need is a 4K monitor or tv to see the quality 
no....youtube does have hd in 1080 p...but that only means 1920 x 1080 pixels, but the compression rate is very poor....means bad quality....vimeo only has 720 p , for hd you have to pay ...and also poor compression....so 4 k doesnt make sense, if even hd doesnt make real sense