GH4

Yup, I think OD is right. With smaller sensors there are usually compromises and that is normally low light and grain.

Yes, however the size is not the only difference between the cameras. These are different sensors.
If you bring the light in the two cameras to the same level (by openning the GH4), do you also double the noise, or does the GH4 handle the noise better?

It is no use to compare this because you buy GH4 for its 4K and Canon 5D3 is not, except you want photo from it. :)

All I am trying to understand is: Do I buy the GH4 now or do I wait for the 5D mark 4K, in terms of quality.

It depends on how much it cost and how long to wait ? Sure Canon should have a 4K comparable to Sony and Pany.
I know you have Canon so old lense can be used.

Yeah, switching depends a LOT on your lens investment. If you have a lot of expensive Canon AF glass, then you may want to wait (and hope) for a new Canon body.

I was able to unload a few Canon lenses and get Lumix equivalents. And most of my glass is old Pentax/Canon FD glass that will work with any camera body (with an adapter). So it made it easier for me.

I will say that although the GH4 sensor is smaller than the APS-C in my old T2i, T3i and T4i bodies, it handles low-light a lot better. But I have seen direct comparisons between stuff from the 6D (full frame) and my GH4 and the full frame sensor wins in low-light.

Well, I bought the GH4 two days ago, and I'm pleased about it so far. There is one issue I'd like to address, and I hope those who own the camera can help. The footage (the HD at least, I still have to purchase a 4K capable laptop) straight from the camera looks great, sharp, and actually warmer than I expected. No worries there.

There seems to be an issue with my LCD screen, however. Or maybe it is something you guys also experience. On certain patterns I see lines and flickering that would probably come close to being called moiré. For instance, it is particularly noticable on a bookshelf with similarly colored books, on the blades of a windmill, stereo speakers, hairs of a cat, etc. It's actually there in too many situations, but it doesn't show in the footage itself (so that's a relief).

I've been going through the menus yesterday and tried every different setting. It's always there, manual/auto focus didn't make a difference either. Do any of you have an idea if this is normal, and if not, what it could be?

If you shoot 4k, there is no moire of any kind. Other than that, I started with the settings from this tutorial:



https://www.youtube.com/watch?v=6NgtBUIQPbM&feature=player_embedded

Thanks Dave. There's actually no moire in any of the footage, but it's on the LCD display that I get moire like patterns. Do you get those too?

Like Dave said, there's zero moire when shooting in 4K mode, since the sensor output is 1:1. But in 1080 mode, there's still the possibility of moire, but not nearly as bad as other DSLRs or previous GH models.

I see "stepping" all the time on the LCD, but never saw that transfer to the recording.