what about the
X900 Panasonic seems that quality is equal or maybe sharper image from
Sony CX730, and 5 axis stabilization . with hybrid stab
Tested the X800, the X900 and the CX730 and sent them all back. Image wise the X800 and 900 are identical. Image is what is accepted as sharp, in the same way that the Sony NEX 5/7 and CX730 are accepted as sharp, but in reality none of them reach the standard of clarity of the GH2. The X800/900 have a slightly less 'sugarey' colour rendition than the Sony CX 730 but again, the GH2 beats them both.
Panasonic still insists on locating camcorder connector bays behind the screen and this makes them a right royal pain to access when gimbal mounted. The screen has to be sort of half open. The X800 does in fact have a slightly smaller screen with off-centre hinge that, when reversed, just reveals the stupid flat proprietary a/v out. The X900 has a bigger screen that completely masks the same a/v connector whereas the Sony CX has the a/v out on the handstrap side of the camera. Both have horrid touch screens to access all menus, the X900 has a useful manual assignable lens ring, the X800 doesn't, the CX 730 has what looks like a useful assignable button/wheel that turns out to be all but useless.
Both X900 and CX730 can record 1080p50 - which is wonderful if you can access it reasonably easily. It is not part of the current AVCHD protocol and is therefore not always supported and requires third-party conversion. The GH2 cannot record 1080p50(/60), only 1080i50(/60) or 720p50(/60). The X900 & CX700 series are locked into either PAL or NTSC, depending upon where they are purchased. A hacked GH2 has access to both standards and can record 25, 30, 50 & 60 fps - as well as variable frame rates in 'Cinema' mode.
Until the Z-15 gimbal is available for ALL cameras, and not just the NEX and GH2, you have no other option than to use one of the A.N. Other camera mounts and ropey-almost-there 'stabilisation' systems currently on the market that all claim wondrous things, and which none actually deliver reliably.