Oly 9-18 and Panny 7-14: big IQ difference?

Rens wrote:

I've been planning to get the Oly 9-18 to go with my OMD. I had one before and liked its range and compactness, though always had reservations about its IQ on the Pany Gh1 (a good camera I just never grew to love).

Now I'm wondering should I pay the extra and get the Pany 7-14 instead. I usually use the wide end, so lack of range wouldn't be much of a problem.

I'm not bothered about IQ at 100%, but overall quality at A4 matters to me.

Does anyone have both and can give me an opinion as to whether there's a big IQ difference at around 9mm? It would have to be noticeable for me to give up the compactness of the 9-18, quite apart from the price difference.

I presume too that Oly files wouldn't have distortion fixed in camera, either RAW or JPEG. Mostly not a problem for me, but it looks to me as though the Oly software does a better job than PS 5 can do later.

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Rens
There are optimists and there are realists