Finally: I've tried both panny 14/2.5 and oly 12/2.0. The oly focuses faster and is much, much sharper.
However, it is also much, much more money. However, it does pair better with the 20.

I updated it brainlessly.

I already updated it :)

I bought 14mm 2.5 a new one kit part for 155 GBP, waiting for it next week :-)

No I haven't. I'm not a big fan of shallow DOF on wide angle. If I get blurred background, that's because I had to use f/2.5 in low lighting. By default I prefer deep DOF. Shallow DOF using 50mm or 85mm lens for special occasions.

Look for GF2 kit deal. Soon or later it will be discontinued. Then get it at around $400. Keep the lens. Sell the body. That's how I've been buying m43 lenses.

A pancake trio is complete. 14mm, 20mm, Hexanon 40mm.

The 14mm seems weightless. 20mm has much better build quality. Other than that, I like the 14mm. Fast AF. Great for street photography. Silent focusing & much better AF-C for video. This lens deserves "HD" label.

BTW I got this from GF2 kit. GF2 body going to ebay. It's so tiny. GF3 would be smaller. I don't like... tiny bodies. GH series is just right size.

@No_SuRReNDeR

it is great, very fast auto focus, faster than "follow focus" :-)

Also thanks @Issac_B

My problem is I don't like to look at still pictures for VIDEO lens choices. There some shots there of the stock 14-42 kit lens that look fabulous, way better than any video footage I've ever seen of the same lens. There's not much video footage with the Oly 17mm and what's there, is either badly compressed or meh in some other way.

If you want a good example of what the 20mm, 14mm, and 17mm Oly can do take a look at the flickr pages for each lens.

http://www.flickr.com/groups/lumix-pancake/

http://www.flickr.com/groups/lumix-14mm-pancake/

http://www.flickr.com/groups/mzuiko17mm/

I looked at a ton of photos before I went with the 14mm. The 14mm is sharp wide open at 2.5, and that extra bit of focal length is nice. It doesn't feel distorted and my decision was based on wanting to have a lens that could go as wide as possible without feeling ultrawide ( to offset the 4/3 sensor size limitation)

The 14mm is a much better lens than the 14-42 kit lens. It autofocuses fast and in my experience the 14-42 can behave a little weird and add a little banding. No other lens does that, not my manual lenses or the 14mm prime so I'm convinced it's the behavior of the 14-42.

The Oly looks decent for the price, but from looking at Flickr I thought a number of photos looked a little soft wide open.

I haven't used the 20mm but have heard nothing but great things about it. I almost bought it and will probably pick one up soon.

There's also the Olympus 12mm f/2.0 which is good but was a little too wide for me. Michael Mills on vimeo has shot a ton of stuff with the 12mm with a hacked GH2 and it's a very nice lens, just a little too ultrawide for my tastes.

http://www.vimeo.com/user4047714/videos

14mm is on the way to my door tomorrow. After selling GF2, net cost would be $150.

@stonebit
Yes it could be locked, but than it is Manual Focus ...
I just need that focus is fast, as using/walking with "steadycam" you can't touch the camera or LCD ...
Using Canon HFS100 don't have these problems, but want to use GH2 ...

Yes, I think the lens AF speed would be fine, though we won't know without testing.
Curious to test an old camera firmware to see how fast 20mm AF(in video) can be.