While there are many advantages in using modern CSC cameras, one of the drawbacks is the relative slowness in many lenses. While there are fast prime lenses available, they are often very expensive.
A solution that will work for some, is using classic lenses from 35mm cameras and adaptors.
Focus and aperture will have to be set manually, but using M or A modes, you can get back your fast prime lens of the past, and the wonderful razor thin depth of field that goes with using a fast lens.
Photos taken with a Zuiko 50mm f1.8 (@ F1.8) on the Olympus OMD-M5.