Which legacy lens sharp at f1.2 or f1.4?

I just got my OMD EM5 and found the IBIS makes the manual focus really pleasant. I tried with 45mm 1.8 and can relatively quick to nail focus.
Now I'm looking for fast legacy lens for portrait.
Focal length= 50mm (35mm equivalent)
Aperture= f1.4 or faster

Budget:

Is there any legacy lens which is sharp at f1.4? or are all modern lenses (Nikon&Canon 50mm 1.4) sharper?

Thanks.