There have been one or two rumours that Sony might be about to introduce a 100mm f/1.4 GM lens. They may not be true, but it would be a great lens for Sony to add to their lineup. Nikon has its 105mm f/1.4 and while there is an FE mount version of Sigma’s 105mm f/1.4 “Bokeh Master” Art lens, it’s essentially still an adapted DSLR lens.
Sony Alpha Rumours has posted what might a possible spec sheet for an upcoming Sony 100mm f/1.4 GM lens – although “spec sheet” would be generous. There’s very little actual information, even if it turns out to be true. But the idea of a native FE mount 100mm f/1.4 by Sony themselves in the form of a GM lens is quite exciting.