Both are quick-thinking, take-charge types who are direct with their words.
ESTPs [Han Solo]:
casual in dress (e.g., tie askew if they must wear a suit) and manner (hearty handshake/laughter)
earthy, especially in the humor department, and charming in a rough diamond kind of way
say what they think as they think it, and may stick their foot in their mouth at inopportune times (and possibly even try to talk with said foot still there)
competitiveness tends to be balanced by playfulness and may be expressed through roughhousing
can appear deceptively laidback unless enthused by an activity, and then may seem frenetic to an introverted type such as myself
divorce--and remarriage--seems to be fairly common among this type
feel caged in by too much structure and get restless, fidgety
ENTJs [Darth Vader]:
sharp-dressed (e.g., the tie will not be askew--it wouldn't dare!) and forceful in manner (they don't walk, they stride)
usually direct in speech but can sound convoluted if they're working through a concept or plan right as the words spill out (with an accompanying dreamy/deranged expression which becomes more fanatical as their thoughts solidify)
cerebral, spending more time in their minds than ES types, due to tendency to strategize in any and all situations
come across as intense, which can intimidate timid souls but energizes likeminded ones
hell is sitting still
pile up the achievements, one of which may be a trophy spouse (or golddigger if they're not careful)
feel caged in by structure imposed by anyone other than themselves and will work ceaselessly to rearrange things to their own liking
Disclaimer:
These evaluations are based on limited interactions/observations with individuals whose types I don't have the ability to verify through testing. Also, I've known more suspected ESTPs than ENTJs.