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In Episode 5, no one would have even attempted to talk back to Vader. In Episode 4, the dude Vader choked was completely insulting Vader. If Vader was really the Emperor's right hand man (as shown in Episodes 3, 5, and 6), he would never have done that.
Also, Tarkin (the commander of the Death Star) basically gave him an order when he told Vader to stop force choking the dude. Nobody would have talked to Vader like that in episodes 5 and 6. And Leia referred to Tarkin as "holding Vader's leash", another reference to Tarkin being above Vader.
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All this can be explained by just accepting the Lucas is a lazy and poor writer.
Best stated by Maddox here
http://www.thebestpageintheuniverse....cgi?u=episode3
"Near the end, Lucas takes a [censored] on the script and makes his crew translate it into an ending that putters across the finish line. The product is a scene where Anakin tries to literally choke Padme using the force:
Yes, that's right. The entire reason Anakin switched to the dark side becomes unraveled when he tries to kill Padme, who was the reason he switched to the dark side to begin with."