Getting slow shutter speeds hand held, and sharp, is about technique too, but there is also a difference in how steady people's hands are.
Many people say that as long as you stay with 1/focal length of lens, (1/50th s for 50mm lens, etc), you will get reasonably sharp images. I use breathing techniques where I inhale and exhale about half of the way, I brace my arms against my body as much as possible, I relax, and try to do everything that I can, but I can't for the life of me get sharp pictures that way. I even bought a fancy shutter release button that threads into the cable release socket to aid my very large hands in not jerking the camera too much when I release the shutter. It doesn't work.
I may get lucky and get some pictures sharp that way, but I have to be at 1/125th s when shooting with a 50mm lens, or I just will not reliably get a sharp negative.
I think it's about finding your own personal limit, and using proper technique while practicing a lot. What you find might entail that you need to use a monopod, or some other aid to help you with longer shutter times.