Sainsonic is launching a new lens on Kickstarter the Kamlan 28mm f/1.4, but they also have a roadmap for some future lenses of interest in addition to their already broad range of Kamlan and Zonlai lenses that are available.
Q2 2018
21mm f1.8 APS-C
Q3
50mm f1.1 Mark2
Q4
32mm f1.3 APS-C
15mm f1.8 APS-C
These are some interesting focal lengths and apertures, to say the least, but Machang Optics lenses are relatively affordable so they are a good option for experimentation. Also, cheap Chinese lenses have gotten a lot better in recent years so there is no longer a reason to steer clear of them unless you’re obsessed with perfection.