This Lumix G 25mm is an exceptional lens for portrait or travel photography, given its 35mm equivalent length of 50mm, and the wide f/1.7 aperture makes it easy to shoot handheld in low light conditions...

Panasonic 25mm f/1.7 ASPH LUMIX G

From http://www.david-ruether-photography.com/MFT-Lenses.htm#25mm (photo samples are also there) - This compact, fast, and light "normal" lens for the MFT format performs very well over a wide range of stops (from wide open at f1.7 to a bit beyond f11).

Sharp to the corners over a wide range of stops; Low CA; Excellent for infrared photography; Compact and light-weight

None (other than for not having in-lens stabilization; but I don't find this a problem for my use

New Panasonic Lumix G 25mm F1.7 ASPH Lens Black review

Panasonic has done very well with this lens: for the price point, you get a very sharp, very capable lens that's easy to use. If the kit lens isn't fast for your needs, the Panasonic 25mm ƒ/1.7 would be an excellent companion.

New Panasonic Lumix G 25mm F1.7 ASPH Lens Black review

The Panasonic Lumix G 25mm F1.7 ASPH is a compact and lightweight prime lens for Micro Four Thirds camera bodies. It offers an equivalent focal length of 50mm in full-frame terms, and an equivalent maximum aperture of F3.4.