Nice writeup but the comparison to the Sony NEX bugs me:
but overall the NEX-5N with its smaller body and bigger sensor, not to mention faster continuous shooting
1) The body may be smaller, but it's not an actual advantage. When discussing relative sizes of cameras can you please
take into account lens size? It's simply ridiculous to rave about how small NEX-series cameras are when practically speaking they've got huge lenses. By all means use the smallest practical lens if you wish, but it's probably worth nothing that the Panasonic x-series zoom is as small as a pancake while offering 3:1 zoom.
2) Sensor size is irrelevant. Image quality is relevant. Now we know the NEX has better IQ (dxomark gives it 77 overall vs. 60 for the GH-1, which we can fairly safely assume will be similar or identical to the GX-1), but then the pancake on the NEX is f2.8 vs f1.7 on the Panasonic which would pretty much cancel out the sensor advantage.
3) Finally, I believe the NEX-5N's continuous shooting mode advantage is limited to a specific mode that locks focus and exposure on the first shot. Under normal continuous shooting it's pretty much identical with the GX-1. Meanwhile, the GX-1 has a 20fps shooting mode with different restrictions.
So the three summary points here are either wrong or misleading.
And of course you fail to mention the Panasonic's handling advantages (hard controls everywhere, function buttons, regular hot shoe...). Surely these might be interesting to its target audience (and yours).