Specs

• 3 Super ED lens elements, 1 ED lens element, and 2 ELD elements
• Manual focus clutch
• L-Fn button for assignable functions (now we copy Samsung)
• $1300 price
• http://www.amazon.com/gp/product/B00WENHU6S/

I'm really interested in a rectilinear Ultra Wide Angle lens for my GH2 but can't decide between these two. I intend to do video and long exposures with it in all conditions (including bright daylight), that's why I'm interested in the ability to fit filters. On the other hand, the idea of going for a wide angle lens is to get that massive perspective, I'm really fond of it for architectural shots.

These two lens seem to be those that offer the widest rectilinear perspectives for the M4/3. I'm not interested in a fish-eye because I would like to shoot 1080p/i without loosing quality after de-fishing. If you aren't already familiar with these two lenses, I would sum up the plus and cons that really matter to me like so:

Panasonic 7-14mm (+ widest reach) (- can't fit filters)

Olympus 9-18mm (+ can fit filters) (- doesn't go as wide)

Price, constant aperture, small quality differences don't really matter to me.

In summary, as far as it goes in terms of what matters to me, what one has the other doesn't. That's why it's so hard to choose for me. Yes, I already researched this comparison thoroughly but never saw it applied particularly to video. Perhaps someone here faced the same dillema and managed to make a decision or could provide a recommendation based on something I'm unable to see here.

Care to comment?

Many thanks!