[Klaus]

The sensor may be the same but the filter in front of it not - at least there is such a theory, regarding especially the 7-14 mm f/4 but also other lenses:

http://alanwatsonforster.org/writing/mft-purple.html

http://kolarivision.com/articles/interna...nsmission/

 

I meant "anecdotally" because the explanation doesn't seem to be popular/well known.

 

Ok, learned something. Although I am slightly wondering whether this is more related to the 'sensor system revision' rather than Pana vs Oly.

The 16mp sensor has also been used with a variety of different AA filters over time.