At long last, I've acquired a slightly newer Lumix which comes close to replicating both the dimensions and the overall 'feel' of one of my former favorite cameras, from a few years ago, the Lumix GX7. My new purchase - 'new' to me, though actually it came lightly used, purchased from a good photographer - is a Lumix GX9.
I think my 15mm PanaLeica lens may wind up semi-permanently affixed to the front of it---
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The top plate has design cues from both the GX7 and the GX8. (I rather like the round exposure compensation dial, though its placement isn't as well implemented as on the larger GX8.)
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The rear is pretty standard stuff, with a screen that conveniently flips out and down, something I appreciate with certain angles or shooting stances. Most of the controls feel totally familiar for someone who has shot quite a bit with other Lumixes---
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The other really nice 'extra', which the person I bought this from included in the sale, is the factory grip - which so far seems to make the camera feel like it fits much better in the hand. Without the additional grip, the built-in grip is beautifully designed, but doesn't feel as nice or as practical as that of the GX7, or that of the much larger GX8.
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The final benefit: the click-stopped aperture ring on my 15mm lens works perfectly with this camera... whereas it didn't (work at all) on my Pen F. Kind of fun, being able to set the aperture 'manually' so to spek, again.