I do find the G3X compelling. I am an FZ1000 owner, but I have always been a fan of Canon colors and the Canon flash systems even for small compact cameras. I like to do creative lighting with my small cameras.
I know many people have complained about the lack of an EVF and full swivel screen on the G3X. The FZ1000 has both of these and is only 3.4 ounces heavier. Add the Canon EVF-DC1 which weighs 1.5 ounces and now the Canon only saves 2 ounces of weight.
I am
not one who has to have an EVF or swivel screen. I think the tilt screen is
fine on the Canon just as my tilt screen on my RX100M3 is fine for my uses.
The FZ1000 is
bulky for sure but it
feels light in the hand or on your neck and when you add the EVF to the G3X the bulk savings of the Canon is not great. The FZ1000 Lens hood is big but can be turned around for storage.
But where the Canon G3X is disappointing to me is on the AFS and AFC Speeds.
From DPReview First Impressions Canon G3X AFS
Performance-wise, the G3 X can shoot at up to 5.9 fps in One Shot (single) AF, with that frame rate dropping to 3.2 fps in AI Servo (continuous) AF. These figures are for JPEG only, though, and in Raw the continuous shooting rate drops to ~1 fps (like the G7 X).
This is DPreviews Explanation of the FZ1000 AF speeds.
http://www.dpreview.com/reviews/panasonic-lumix-dmc-fz1000/
I find that with my 95MBS cards the FZ1000 buffer clears pretty fast in Raw plus JPEG but I will generally shoot in RAW only since the FZ1000 has in camera RAW processing and if I want a JPEG it's only a few clicks away. The FZ1000
DFD Autofocus technology works. Its great in low light and good light.
Being able to shoot 11.8 FPS in RAW if I want it of 5.6 FPS in Raw with full live view is very nice and far superior to 1 FPS of the Canon.
I think the reason this is a consideration for those looking at the Canon is because the 600MM focal lengths is going to tempt you take wildlife, stage/theater, air shows, and sports photos. If the light is low and you're counting on RAW 1 FPS is not enough and 3.2 JPEG is also not ideal for catching the peak moment. Or the Stage lighting or indoor lighting is weird and you want to shoot in Raw for white balance reasons this is another limitation.
If your subject is Moving forward or back, AF-S will also leave you with blurry photos. I do feel like Canon has crippled this G series as it did with my previous G series cameras by leaving the AF system a decade behind.
I would like the extra 200mm on some occasions but not at the expense of the amazing AF system on the FZ1000.
And if price is a concern the FZ1000 can be purchase for $200 to $280 less and if you add the cost of the EVF on the Canon you're saving almost another $240 plus tax on that savings.
Here is my FZ1000 gallery:
http://www.scottzinda.com/Point-and-Shoot-Cameras/Panasonic-FZ1000/i-7XPxWzb
I think there are a few shots in here the Canon would have struggled with.
I don't blame anyone for being interested in the Canon as I also am, but for this price I think the Canon doesn't cut the mustard.