2-4 are the most common, then 1, then 5. It's both rare for people to be unable to picture things in their minds at all, and for people to be able to see things in complete perfect detail just from their memory. Those kind of people are the ones that can memorize a password not just from remembering the numbers themselves, but also by picturing how the password looked on the paper or screen they read it from in their head. Dr. Adam Zeman, a scientist that studies the phenomenon, estimates about 2.6% of people are a 1 (hyperphantasia) and about 0.7% are a 5 (aphantasia), with everyone else in between.
2-4 are a smooth spectrum that varies from person to person, and ranges from "I can see something in my head in very good detail" to "I can see a vague colorless shape of something I remember", and everything in between. I'm about a 2.5, myself. I can picture an object or scene, and it will have colors, shapes, and general orientation, but specific details are sparse, and I usually get some things wrong if I double check it with what I'm imagining.
This is a blog from someone who has full strength Aphantasia, and it's quite detailed and specific as to their experiences and abilities compared to other people they've talked to:
https://www.facebook.com/notes/2862324277332876/
Similar concepts also extend to other senses than sight. On one end of the spectrum, some people are completely unable to conceive of music unless they're actively listening to it, while on the other, some people can note for note "listen" to music in perfect fidelity in their head to the point that as long as they can remember a song, they don't need to actually listen to it for the full experience. Most people are in between, just like with sight. The same goes for smell, taste, and touch.