|Canon EF 50mm lens lineup|
Sigma, the independent lens manufacturer has been coming on strong lately, building on their successful ART line of lens. Read my post on an interview with their CEO. Canon will be updating their EF 50mm f/1.4 and EF 50mm f/1.2L lens some time in 2016. Their designs date back to 1993 and 2006 respectively and can benefit from a Series II upgrade.
Below is a good video comparing ten 50mm lens from various manufacturers. They all come in mounts for Canon, Nikon and a few other camera brands. By the way, the most expensive 50mm brand, Zeiss, has just announced a 'cheaper' Milvus line to try and compete with other lens makers.