[Brightcolours]

I find nothing objectionable there. 

It is as if the colours in the blur are being pulled apart, like you see in strong astigmatism. I don't now how to describe it better than that and the above "muddy". It is rather like a mix between what I get with the Tokina 12-24mm when using a 12mm extension tube and what I get from a simple design 3 element film projector lens I sometimes for photography(fun), the Old Delft Delfinor 140mm f1.8 with no coatings what so ever.
That lens does make smooth bokeh, but with an odd "muddy" quality (besides the horrid CA).

Maybe it is just the quality of the small samples, and future samples will show this lens to render without (that) problem.