Yes i'm afraid ZF is quite rubbish
. The sunburst on the gen is very subtle and in photographic terms 'matt' wheras the sunburst on the ZF is in your face and 'glossy'.
The ZF is quite a beautiful watch as a standalone actually. When i first got the watch, having not seen a gen before, I was quite impressed by the dial. I would say that this is the layman's idea of a sunburst; rich, brilliant and sparkling. The sunburst is quite similar to the one found on Patek 5396. Unfortunately compared to the gen this is quite 'vulgar'. Its as if patek is saying 'a gentleman does not shout'. The sunburst here is gentle and elegant. An aristocrat's sunburst if you will.
Here is an illustration:
ZF
Gen