Dragonair power up

Dot do it. A week ago i evolved the same lvl and iv as Yours. Today i cought 686cp and 82 iv dratini, but i dont have enough candys to evolve him. Be patient, and You will be reworded.

Lol? Do It!! Level 29! For only 100 candies youll have top tier mon in game, and 70% ivs are quite good!
To the other answer, do you really think that is worth evolve the other los level dragonair only for 10%iv difference? You save a lot of dust and dratini candies evolving the level 29 one

I posted some pic's of my Dragonites a couple days ago and the CP diff was 22 on 6.5% iv variance. They both had 15 atk and 13 Sta but def was 15 and 13 respectively. I believe def IV has the smallest CP impact tho.
It really hard to say whats better without seeing what your moveset ends up being and how many dratini's you catch over the next couple months. Neither of which anybody knows. If you find a 100% IV dratini in two weeks will you cry or will you go and grind?
IF gen 2 comes out Id be more inclined to evolve that because Dragonites will no longer be king. Another 2800 cp dragonite would prolly help you collect stardust and "profit now" vs waiting and losing that "profit." Trust me if Gen 2 comes out we all have way too much to build and your gonna need that stardust.