True, the Panasonic cameras can be limiting for certain types of shooting.
I shoot varied things personally (landscape, industrial, fetish, and have done a bit of everything for the most part). But for pay, I shoot mostly event photography, and action event photography (dance competitions, martial arts competitions), and some product photography and for that kind of work, I *NEED* certain features that I cannot get from my Panasonic bodies.
I need to have AFS 2.8 Zooms, Fast 2.0 or 1.4 primes, with a camera body that has clean high ISO images up to a certain point in jpeg. You need a good, easy to use flash system with available flash modifiers (fong lightspheres and similar). Also, for product work, having very clean files with lots of detail/sharpness. True, a lot of that can also come down to glass as well.
When I do dance competitions, I often shoot at ISO 4,000-5,000 and at f4.0 to f5.6 to get myself a shutter speed between 1/200-1/500th to freeze action and still have some depth of field in case the focus is off or the dancer(s) move diagonally from the plane of focus in between frames.
Right now, Panasonic and Olympus do not have a body that would let me do the jobs that sometimes pay my bills. My Nikon bodies do that. However, I have stopped carrying a Nikon body with a grip, fast zoom and a few primes along with me everyday.
I got a GF1 and the 20mm lens last year and it became my carry everywhere camera, replacing my other cameras in the quest for the "perfect" always have on you camera. The older cameras that I still have and use for certain things are the Ricoh GRD1, Sigma DP1, Canon G10.
I picked up a Japanese GH1 and the 14-140 from a friend who had received one as a gift and wasn't able to use the camera because of the Japanese language menus. I use that camera primarily for video work. For video work on the GF1/GH1, I don't mind using my adapted Nikon glass. It's fun and in a way, can take me back to what it was like when I first started learning how to use a camera, manual focus, manual exposure.
I even don't mind using MF, etc when doing fun things in a controlled/studio type environment with my Panasonic bodies. But the minute it becomes wildly changing lighting conditions, or very, very low light, I'll grab my D700 and some fast primes/zooms and know that I'll be able to get what I need to get paid.
I love my panasonic bodies. I like their handling/ergonomics for stills use, and somewhat for video. For video, I find I need to bolt on a few things to make it all handle better.
I'm happy with the latitude that I can get out of the RAWs. I haven't shot more than a few dozen stills shots with the GH1, I've been using it almost exclusively for video. I do wish that there was cleaner high ISO on the GF1 or the GF3 whenever it comes out (to me, the GF2 is neat but I like having more size and more manual control).
Say a good 1,600 or so. I'm not expecting miracles and crying out for D3/D700 quality High ISO, I know the realities of why that isn't really possibly due to sensor differences and all of that.
It does seem that with the Nikon P7000, Nikon is taking some steps in the right direction for usability, and not just shoveling out a P6000 replacement because of the short P&S upgrade cycle. If they can take some of that "usable by actual photographers" pixie dust and sprinkle it on their long rumored mirrorless body, they might be able to come up with a winner.
I think that's enough of my ramblings for now.
Chris