I don’t think I’ve posted my thoughts on the Panasonic 7-14mm f/4. I’ve had it for a few years now, and use it for super wide angle shots of interiors of the events/weddings I cover. It has an angle of view similar to the 14-24mm’s of the bigger cameras, but it definitely doesn’t “draw” like them. The micro 4/3 sensor is a different aspect ratio, and much smaller, so all the wider angle lenses render life, people, and architecture in a different way. I still keep it around because it’s so small and handily fits into my small side bag. The mistake with most gear is usually asking too much from a specific tool. This lens is not a good choice to stop low light action, or render pretty portraits–no it’s good for situations like the one below, when you need an edge to edge picture of a room that can be cropped in many ways. With the in body stabilizer on the OMD one can shoot like 1/8 of second to keep the ISO low. Having this small kit in the bag is good for tight situations where you just have no room to back up.
The other use I have for the Panasonic 7-14mm f/4 is on the Pocket Cinema Camera. It is still a pretty wide ~21mm feel, and isn’t as distorted as on the OMD so I think it can be used for large groups and environment shots. The bulbous front end is something you have to watch out for though. No filters can be used, and special attention must be payed to keep from scratching it on something. Bright light sources can also cause crazy purple flares.