bokeh highlights

I got the da*200mm as an xmas gift. I am very satisfied with the image quality but are the visible patterns in the bokeh highlights in the example crops normal. In the first one the highlight seems ok but the other images have a pattern. Can anyone tell me why this is occurring?

Take a look at the PHOTOZONE test of the DA*200.
http://www.photozone.de/pentax/370-pentax-smc-da-200mm-f28-ed-if-sdm?start=1
Cheers
Dave

Thanks. You have set my mind at ease in that it is normal for this particular lens and not caused by a fault in the lens.