They can provide picture quality that's about four times better than you get from standard HD, so long as the content supports that resolution (on which, more below).
Ha nwere ike inye àgwà ihuenyo nke dị ihe dị ka okpukpu anọ karịa ka ị na-enweta site na ụkpụrụ HD, ọ bụrụhaala na ọdịnaya na-akwado mkpebi ahụ (nke, karịa n'okpuru).