Panasonic Lumix G 25 mm f/1.7 ASPH. review - Introduction - LensTip.com
Field review: Panasonic Lumix G 25mm F1.7 ASPH - compact, affordable and capable: Digital Photography Review
Amazon.com : Panasonic Lumix G H-H020 20mm f/1.7 Aspherical Pancake Lens for Micro Four Thirds Interchangeable Digital SLR Cameras : Compact System Camera Lenses : Electronics