I still haven't decided on my video-making lenses but I've been trying to do something to make food photography better for me. In one of my initial digital-only shoots, I took an Olympus E-1 and the ZD 14-54mm f/2.8-3.5 and used Ott-Lite lamps with daylight type bulbs for which they were known, to photograph ice cream without melting it, and to show sandwiches, waffles, eggs, and other items as realistically as possible. The images hit home with so many people and people were yelling at me for posting desirable images of food at night when restaurants weren't open.
So, thinking more casually, the Panasonic GM5 and 15mm f/1.7 lens seemed a perfect combination for casual food photography--maybe, even for serious food photography. While the GM5 also had an instant rebate available, I chose to wait, only buying the 15mm f/1.7 lens.
Either way, a US$100 rebate is significant--on US$599.99 or $899.99. I'd still rather get the GM5 without the 12-32mm f/3.5-5.6 kit lens. The GM5 and 15mm f/1.7 seem a perfect combination, especially up against the FujiFilm X-100T. I'm not saying that the GM5 is an incredible camera body but it's quite capable for its size and can generally keep up with the GX7.
So far, I've only had the 15mm f/1.7 lens on the E-M1. It seems an appropriate lens for the slim E-M1. The lens is tiny, given that it was meant for the GM1 and GM5 specifically. It's not a Leica design. It's a Panasonic design, approved by Leica. From what I've seen so far, it has the Panasonic purple fringing, according to various web sites' articles.
Sharp at most apertures
Keeps focus well for video
No aperture ring lock for Auto setting
Fiddly bits with filter ring, front lens cap, lens hood
Occasionally hunts for focus in lower light situations
|15mm on the E-M1 looks reasonable with lens hood|
I'm generally pleased with the sharpness and the ability to use it at a very close distance.
Outdoors, on the E-M1, it did well.
I need to take the GH4 and the lens out to see how well it will work.
|15mm lens on the GH4 looks tiny|
Update 2015.03.26: I've had the 15mm f/1.7 over a month now, and I've shot a lot with it, both on the GH4 and the E-M1.
It's a good video-making lens. It keeps up well. Without image stabilization, it is fine. Photos are almost always really sharp at any aperture.
On the other hand, I've lost the lens cap that goes with the lens hood already. The lens hood has unscrewed itself a number of times and I've noticed it early enough to keep it from falling. At US$80, I don't want to lose the lens hood. At almost $7.00, I can afford to replace the lens cap. The filter ring has to be unscrewed to use the lens hood, so that's a piece that can be lost easily and it's so dainty that you might never find it, until you bend it with your foot. Also, during still photography, it will hunt for focus in lower light situations, and the Panasonic purple fringing is present on the E-M1.
That said, it is one of two lenses that I use the most.
Update 2016.01.21: It's going on 1 year that I've had this lens. I've used it in the dark quite a lot to record video and take photos. It really has been a good lens, surprisingly. Thankfully, the drought has kept it from rainy conditions.
Using it on the GX8 has been good, and it looks a good fit.