I went to PhotoPlus over the weekend. I tried out a bunch of cameras and I figure this is as good a place as any to share my thoughts.
Panasonic GX7 - I wanted to like this, but the EVF just feels tiny, like the old accessory EVF for the GF1. It's nowhere near the same league as the one in the GH3, nor is it anywhere near as good as Sony, Fuji, or Olympus's finders.
Panasonic GM1 - It's amazing how small they've managed to get this one. It's too small for my hands, but it's super-cute. But the onscreen UI elements are really choppy and seem to be updated at a low framerate. I guess they had to cut corners somewhere.
Fujifilm X-E2 - Same body, new guts. It's snappy and smooth where the X-E1's EVF chopped and lagged. It feels just fine, but there's something plasticky about the build quality of the Fujis that makes me feel iffy. Fuji's implementation of focus peaking is weird, too: it uses very fine, silvery-white pixels that are almost impossible for me to pick out in the EVF.
Olympus E-P5 - Wow, this camera feels fantastic. It's so solid and smooth and just inspires tons of confidence in me where previous Pens didn't. The controls are great. I'd never get one, because it doesn't have an EVF, but it's lovely otherwise.
Oly E-M1 - Likewise, fantastically built with great controls. Nice EVF. I don't need a $1500 m4/3 camera, but if I was heavily invested in m4/3, I'd get this. When I heard the price of the camera, I said to myself that it better be built like a BMW for that price, and frankly, it is.
Nikon Coolpix A - I bought a Ricoh GR instead of this, and I hadn't had a chance to try it out yet. I was pleasantly surprised: the Coolpix is extremely well-built and feels polished. Controls feel great. The UI uses Nikon's philosophy, which is why I bought the Ricoh, but if I wasn't married to Ricoh this'd be a lovely camera (for about $300 less than it is now).
Sony A7/A7R - This camera is the next evolution of the NEX-7. All the design DNA is there, and there's been a lot of thought put into improving it. The EVF is gorgeous, the camera feels nice and solid, controls are great, menus are divided by tabs into single-screen bites and feel SO nice. I'll definitely be picking one up in a few months. The Zeiss 35/2.8 feels really nice and well-finished. I don't know if it's worth the price to me, but it seems like a fine lens.
Sigma didn't have any of their DP series out on tables, and Leica only had one camera out for fondling. The Fuji booth was tiny, but had a lot of interested people. Sony's was massive and had about ten-twelve A7/A7Rs out for demo, all of which were getting lots of interest.