Honestly, I have seen issues in the GH2 and GH3 at release before. With the GH4 I haven't seen any issues at all. There are things like a min shutter speed for Program Priority mode that I would like to have seen but I have not encountered any true defects.

Here are some of the issues I saw with the GH2/GH3 that have been resolved for the GH4. This is almost more important than what doesn't work now. This is what has been fixed.

1. EVF is definitely not as susceptible to off axis viewing issues.

2. 3rd Party batteries work even for power meter.

3. You can adjust the PASM mode for video when you save it as a custom menu setting. With the GH3 if you saved a manual movie mode with the Shutter Priority setting in a custom slot it would not allow you to change it to any other PASM value. It would show that it was changed but not actually change it.

4. The blackout in single exposure mode is not exorbitantly long with higher ISOs in the GH4.

5. The GH4 can do 60 FPS ETC mode at 1080p.

6. Rolling shutter in Electronic Stills mode is acceptable for almost any situation now.

7. I.Dynamic is now a discrete setting for High, Med, and Low. Only Auto will dynamically adjust the dynamic range compression. There was no Auto setting on the GH3. All settings were basically an Auto setting for that camera.

Here's a video illustrating the audio buzzing and how it is affected by different camera functions:

I experienced a camera crash this past weekend while shooting stills in 3 shot bracketing mode. The camera told me to turn off the power then turn back on. I did as instructed and experienced no further issues.

@mpgxsvcd The new auto ISO in Manual Mode has not been implemented properly in my view as exposure compensation is disabled. There is no way to adjust the exposure other that to take it out of auto iso which defeats the purpose.

@SeekingHeartwood Yeah, I hate this. Same issue on GH3.

Another issue with my gh4 is that the orientation horizontal sensor is off by 30 degrees in landscape. Strangely it is fine in portrait mode. I'm guessing this is a fault with mine as opposed to general.

@thetrickster no such luck although I did discover it works fine in landscape mode upside down. WEX photo saying they will replace but none currently in stock.

@joesh: Yes, the zebras do appear to be based on the LCD/EVF output. You can see the zebras move around with constant preview off just by moving around a room with different lighting conditions.

It would be nice if the zebras were tied to the actual exposure. At the same time, in video mode, you get a live view of the current exposure settings regardless of the "constant preview" settings, so zebras will be accurate in that mode (which is what zebras are mostly intended for anyway).

@mpgxsvcd To be clear, I'm asking for consistent operation of AutoISO, AEL and Exposure Compensation when the camera is in PASM mode. I personally don't consider addressing inconsistent operation to be adding more, simply addressing an incomplete implementation.

It would also be helpful if exposure levels/histo/zebras were visible in the viewfinder while manually adjusting ISO. Someone mentioned this was available when using the screen, but I haven't tried that yet. I use the viewfinder almost exclusively.

I'd also love min shutter speed. Very useful feature on the LX cameras!

I'm encountering same issues that I encounter with both of my GH3s. Timecode needs to be reset often.. will be hours off sometimes, not because of gradual drift, but sudden jumps in time. I set my TC to free run and set the value using TOD (time of day). It's because of this feature that I can use these cameras in multi-cam broadcast scenarios. Doesn't have to be perfect - just within a second or two. I notice I can only keep TC set for a few days at a time, at best. Really was hoping this was going to be fixed in the GH4. Will do some more testing, though does not appear to be invoked by frame-rate changes. Just seems random. I love my GH cameras, just wish they held TC better.

On a somewhat related note, with the GH3, I can use Lumix Link to set the internal time of the camera to be synced with my phone via wifi and can do so with both my GH3s. I can then set the TC to be set according to the internal clock on the camera - boom - synced TC between 2 cameras. Unfortunately, even though I can connect to the GH4 with the Lumix Link app, it gives an error when setting the clock. And in the newer Pany Image App for the GH4, there is no clock setting function :(

Panasonic seems to be very responsive via Facebook, given what happened with the audio bug.

@Jive Don't think there's been a conclusion yet but at least they were quick to engage on the issue. Their FB page seems to be the best route to communicate issues as I've tried talking to their CS over the phone and email and those go into a black hole.

I have just received my GH4 and noticed that there are several problems.

1) The output via HDMI works correctly in 24Hz @ 24p but if I change to 50hz or 60Hz I cannot correctly out put 30p or 25p resepectively on an external monitor. (such as the Atomos Ninja Blade)

2) How can we request a feature to Panasonic? - To send stop/start triggers and timecode via HDMI. Basically when I connect the camera to an external monitor with a Harddrive (Atomos Ninja Blade) the recording should be triggered via the cameras start/stop button like with all the Canon cameras, but it doesn't work with the Panasonic GH4. Can we please fix this as it's a basic feature.

3) Can we please have the ability to output 4:2:2 10bit to record externally whilst either recording 10bit internally as a backup to the SD card or at very least record 8bit internally as a backup. Just outputting 10bit 4:2:2 especially with no start/stop trigger is really an inefficient way to work.

Does anyone else feel the same with these issues as me?