I shoot primarily landscapes and architecture and am torn between the the Panny 7-14 and the Oly 75mm 1.8.
I don't believe in the conventional wisdom that landscapers use WA lenses, 'portrait' lenses can't be used for landscape, or all the other chestnuts that people spout from time to time in that regard. I love quality glass and will make whatever I choose work reasonably well for whatever I'm shooting.
I'm quite often in the Eastern Sierra, the those huge, sweeping vistas of the Owens Vally speak well for the 7-14, but I'm often shooting late at night Los Angeles/Hollywood (where I live) so that 1.8 is equally as tempting.
What say you, folks who've tried both?