Dimension Door remains 4th level in 5e.
Misty Step is 30' (25' for 4e Eladrin) and requires LoS, vs Dimension Door's 500' to a place unseen (in AD&D, it is 30'/level, so starts at 210' and grows from there).
Misty Step in AD&D would be a 2nd level spell - Jump is 1st level and allows 30', and so the main advantage of Misty Step is that it allows passing through transparent barriers that don't otherwise block teleportation, such as windows and grilles. It's clearly weaker than Fly, which is 3rd level.
I think you would be lucky to convince your ADnD DM to let you have Misty Step as a 2nd level spell. I think that Misty Step is a lot more versatile then Jump.