It seems on par with the past couple of years, looking at the archived world lists from Track and Field News.
2014
3:55.17 Genzebe Dibaba (Ethiopia) Karlsruhe 02/01
3:57.91 Abeba Aregawi (Sweden) Stockholm 02/06
4:05.70 *Kim Conley (US) N Balance G 01/25
4:06.63 *Mary Cain (US) Terrier Cl 01/24
4:07.01 Hellen Obiri (Kenya) Düsseldorf 01/30
4:08.15 Angelika Cichocka (Poland) Karlsruhe 02/01
4:08.47 Gudaf Tsegay (Ethiopia) Stockholm 02/06
4:08.66 *Jordan Hasay (US) Terrier Cl 01/24
4:08.79 Betlhem Desalegn(Un. Arab Emirates)Stockholm 02/06
4:08.88 Axumawit Embaye (Ethiopia)
2013
3:58.40 Abeba Aregawi (Sweden) Stockholm 02/21
4:00.83 Genzebe Dibaba (Ethiopia) Birmingham 02/16
4:07.65 Anzhela Shevchenko (Ukraine) St. Petersburg 01/24
4:07.99 Siham Hilali (Morocco) Birmingham 02/16
4:09.11 Axumawit Embaye (Ethiopia) Stockholm 02/21
4:09.36 Rabab Arrafi (Morocco) Stockholm 02/21
4:09.86 Natalia Rodríguez (Spain) Düsseldorf 02/08
4:09.90 Luiza Gega (Albania) Gre Ch 02/16
4:09.95 Anna Shchagina (Russia) Moscow 01/25
4:10.28 Yelena Korobkina (Russia) Rus Ch 02/14
2012
4:00.13 Genzebe Dibaba (Ethiopia) Karlsruhe 02/12
4:03.67 Mariem Alaoui Selsouli (Morocco) Liéven 02/14
4:04.53 Siham Hilali (Morocco) Liéven 02/14
4:06.01 Tizita Bogale (Ethiopia) Liéven 02/14
4:06.25 Helen Obiri (Kenya) Karlsruhe 02/12
4:06.78 Anzhela Shevchenko (Ukraine) Liéven 02/14
4:07.27 *Jenny Simpson (US) Millrose G 02/11
4:07.65 Meskerem Assefa (Ethiopia) Liéven 02/14
4:07.66 *Shannon Rowbury (US) Millrose G 02/11
4:07.72 Diana Sujew (Germany) Potsdam 01/