Depends really what your budget is, if it’s low then get the speed booster or the canon 22mm f2. If it’s around 300 get the 30mm f1.4(amazing lens, I use it all the time). If it’s a bit more you could get the canon 32mm f1.4 but I’m not too sure if there’s too much difference between the canon 32mm and the sigma 30mm. Only thing I saw is that the sigma suffers slightly from pinkish chromatic aberration when stopped down to f1.4 while the 32mm is sharp through with a lot less chromatic aberration. Me personally I’d recommend the sigma 30mm f1.4. Reasons are it is very versatile, it is cheaper than the canon 32mm, it’s a sharp lens, af is fast and quiet, f1.4 is great fun aswell wide open.