I just checked Oregon's current roster. It is quite sick indeed:
Current Ducks with their mile PR's: Ed Cheserek 3:56.43; John Gregorek 3:57.47; Daniel Winn 3:57.62; Will Geoghegan 3:58.04; Eric Jenkins 3:58.11; Jeramy Elkaim 3:59.18; Colby Alexander 3:59.69. A couple others are on the cusp: Sam Prakel 3:41.01 (1500 meters) and Niki Franzmair 3:42.65 (1500 meters). So there are nine (9) current Ducks with sub 4 or sub 4 equivalents.