Summary: I've been replacing my P&S camera with Panasonic Lumix 4/3 camera with 20mm lens and have been really happy with it. Then one day, I happened to chat with my friend whom is a photographer. He recommended me this lens. When I came home, I searched on Amazon and after reading the reviews, I purchased this right away and have been really happy with it. The lens focuses quickly, built quality is great, lightweight and most important, the pictures turned out beautiful.
Summary: The new ones are so expensive I was looking for an alternative. I bought this one used (labeled as like new), but I felt it was more like brand new. It came in it's original box and packing. As hard as I looked, I could not find a single wear mark. I made about 30 test shots at different zoom lengths and apertures, and optically it was excellent. A great transaction, so consider this option to save some coin.
Summary: This is the widest lens I've ever had. Back in SLR days I had a 17mm f/4 on full frame. This 7-14 is the equivalent of 14mm on full frame and it's a phenomenal lens. If you like wide, then buy it. You won't be disappointed.
Summary: Had this lens for a month or so - it replaced a Panasonic LX5 with it's razor sharp Leica 24mm f/2.0 lens, sharpest lens I've ever had, but always wanted more wide angle and a slightly larger, easier to hold camera with controls not-so-crammed together, good electronic viewfinder built-in, and got most everything I wanted with the Panasonic 7-14mm lens and GX7 body in black. Used to think I "saw" in 24mm, would have to say that now I see in 14mm!
Summary: This is a very expensive lens but it produces superb pictures. Highly recommended for landscape, interiors, and architectural photography. It is a fantastic lens in virtually every respect. Thanks to in-camera JPEG correction, distortions are kept to a bare minimum, which is why it is so effective for architectural photographers. Sharpness is fantastic across the frame. It is very well made.