It is mostly practice
However, the camera and lens features may made your manual focusing journey easier or difficult. First, modern lenses and cameras are not made for manual focusing. There is no scale. Fly by wire is not precise because it scales based on how fast you focus. They tend to have a shorter focus throw. Older cameras can have a focusing system optimized far manual focusing like the split prism focusing screen.
More optical groups for correcting optical aberrations.
Zeiss otus 55mm is massive for a 1.4 lens