

I got the 12-50mm together with the EM5 but I decided to not unwrap this lens since I'm not very excited about this it and I wanted to return the the howl kit.
However, today when I was "engineering" back the EM5 into its box, I couldn't resist to test the 12-50mm on the GH2. This power zoom work very well and there is a to me never seen before display on the GH2, that indicates the current focal length.
Focus very quick an silent (better than 14-140!)
didn't checked if its parfocal - damn
manual zoom is also ok
looks like this lens is parfocal:
last video on the video review chapter http://www.dpreview.com/reviews/olympusem5/14
Like previous Oly consumer zooms, I suspect this 12-50 works best around ~25-30, and is probably softer at 50. This was true with my 1st Oly zoom 14-54 (S1). What I just said is pure speculation since I do not own the 12-50
The 6.3 is a let down, but I notice that at 12, it is already 3.5. I wonder at what focal will the lens jumps to f5.6 or hopefully something less, like f4 something. With the 14-54, you only need to go to ~17 and it is already at 3.5....
I'll tell you later on, currently got it at home for testing purposes on my G3. So far it does work reasonably well.
Here is kind of review from Dec 4, 2012:
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