Not seeing any flaws there except moire and subsampling from the reduction to 720p. Of course verticals are going to show aliasing when reduced to 720p.
On camera forums, this is often called succumbing to the "pixel peeping" fallacy. Everyone gets so wrapped up in the minute perceived flaws in their sensor that they forget what cameras are for: capturing thoughts, grand ideas, things for the mind to drink in across the whole frame. They spend months dealing with RMAs and shipping and complaining... which could have been spent learning how to achieve great shots with the perfectly functional camera that they received in the first place.
I guess it's fine to be disappointed, to expect more, but look... it's a whole camera that must fit inside a fifteen gram housing with all its lenses AND a roll motor. This is not a $1000 camera, it's a $1000 drone system and the camera is just a small part of it.