14 days and 24 days

How come my plants are only 2 to 3 inches with 2 to 4 leaves after 12 days(see my Gallery) and this guys looks like his does after 24 days?(see attached pic of the "other guys" plant)
Are my plants going to go through some kind of rapid growth in the next two weeks?

Different strains man they all have different grow rates etc.

Are you growing the same strain? Are you using the same set ups? The same fertilizers? The same lights? Have the plants on the same lighting schedule? Both ph test? Both keep your grow rooms at the correct temps?

variables can alter your results