Re: Panasonic GX800/GX850 or Olympus E-PL9 or...
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That seems like a fair summary.
I use a GX850 as my main camera. I also have a GX9, which is a very nice camera, but is much too brick like for my liking for general use. When I've used the GX9, the GX850 just feels amazingly small by comparison (which is why I got it in the first place).
I would love a GX850 with stabilization (and Bluetooth), so I've had a look at the EPL-9 specs, and I'm awaiting full specs for the EPL-10. The EPL stabilization is a less sophisticated 3 axis stabilization, as opposed to 5 axis in the GX9 and other cameras. Getting stabilization in a small body is going to be a difficult problem, I assume the 3 axis stabilization is a compromise to get it in. I'm hoping Panasonic can fit something similar in the GF11/GX900/GX950, which I've been eagerly awaiting all year.
The EPL-9 has some annoying deficiencies, like silent being a separate mode, not just something you can turn on. The EPL-10 size (on paper) looks like it might be doable, somewhere between the GX850 and GX9, but then on paper I thought I might get on a with a GX9.
I also like the controls on the GX850 (I prefer them to the GX9) and I'm suspicious of moving to Olympus, just because I like the way Panasonics work.
Another limitation of the GX850 is a somewhat pathetic 1/50 flash sync. I also just learnt that the GX850 only does EFC (electronic front curtain) shutter because it only has one shutter blade, it's a very stripped down shutter mechanism. The GX9 on the other had seems to have a very nice shutter mechanism (1/2000 mechanical, 1/200 flash), but does suffer from shuttershock, and has no EFC option (which is the cure for shuttershock).
The GX850 of course has no hotshoe for external flash. I hav successfully use the built in to trigger a slaved external flash, but the GX9 has a very sophisticated flash system. I'm not sure how that compares with the EPL cameras.
You can use other lenses apart from the kit lens. The 12-32 is a very nice lens, and I use it for about half my shots. The stabilization helps a lot, I can handhold 12mm down to about 0.5s. On the other hand, the GX9 IBIS can stabilize my 20/1.7 (small and highly recommended) down to about 1s.
I haven't used video very much on the GX850. 4k is fun to play with for getting stills, like a 30 fps drive mode. It does overheat. For video, I'll usually use 1080p and I don't think it's overheated on me (but I haven't used it much).
I haven't used the face detection AF much, it turns on when taking a selfie. It's good when it works, but is a little hit and miss.