Take a look on the IWC site and you can clearly see the sunburst effect on the dial does not include the sub dials. While these are enhanced images it does demonstrate the effect.
I have gen Ardoise and 3714 laureus dials and the effect on these dials is the same as the LPP, neither have the sunburst effect on the sub dials. I don't see how it would be possible to put the sunburst effect in the sub dials as they have the concentric rings.
I ve seen tons on videos and there is no sunburst in my opinion. There is an user in another forum who as it. I've asked some pics..