These are better right (screens directly from the iPad)?
I mean, all look the same quality now as far as I can tell.
If so, then the problem was tricky.
All I did now is change the sprite sheets from
16 bit reduced to
Uncompressed, committed, then changed back to
16 bit reduced and committed again...
Probably something internal in Unity / TK2D remembered this spritesheet as
Compressed or some other lower quality settings.