Hihi Snooze, I'm not quite sure the Z5 or the NX5 could be grouped under professional video cameras. Anyway, I think the line between what's pro and what's not is pretty fuzzy now, i suppose.
So anyway, let's take Z5 vs 5Dm2. Color wise, I think they are quite similar in specifications, ie. REC709 vs sRGB and both spot a 4:2:0 chroma sampling. But how each camera renders colors is quite different, because their color mapping might be different due to the different software used in each camera. In both case, pushing these color extensively would prob not reap satisfactory results, esp if done in its native codec (HDV and mpeg4 avc/h264).
Detail wise, you will see that despite both claiming to be 1080p, neither will be able to resolve 1080 lines horizontally anyway. So which is holds more details? Truth is: I dunno. But what is important here is not so much what details they can hold, but what do they do to details they cannot hold. What this boils down to is: how does the camera handles aliasing. The fact that the OLPF for 5Dm2 is more suitable for stills capture means that a lot of fine details that should resolve nicely in stills mode, do not get properly represented when in video mode. This is likely to be the fact that 5Dm2 uses some sort of line skipping or pixel binning (I'm not sure) to achieve their 1080p output from their 21mp sensor. Aliasing on the 5D is pretty obvious at full rez but it gets less distracting when the HD video is downrezzed to SD for delivery. Z5 does not have that bad of a aliasing problem because the OLPF for their sensor is optimised for it's intended output.
I personally think that now people use both types of cameras interchangeably. I see 5Ds on corporate shoots, on-air promos etc whereby most of such shoots were done mostly by the prosumer or more professional cameras. Some choose 5D or 7D for that shallow DOF look, some chose them for the quick ingesting of footages into their NLE (although now HDV can be recorded on file-based recorders too).Z5 and NX5 are great for general event coverage where you dun have to struggle with the focus as with the 5Ds and 7Ds and risk missing an important shot. Others chose the HDV footage because it's better supported via multiple platform.
All in all, there are many differences between each type of cameras that warrants serious considerations before choosing them. Some of their features are things we have to work around with, like add third party hardware support or an extra step to sync sound etc, to make the production or post production a little less painful. As of now, there are tonnes of innovations, new firmwares and new solutions that are coming up to "fix" these challenges and thus i believe it's hard to be comprehensive in our discussion. Also i realised that you want to know more about each type of cameras, not because you have an upcoming assignment that needs you to choose either type, but simply because you are just interested. Without knowing your intended usage of the cameras, it's hard to restrict a boundary and make meaningful comparisons in terms of pros and cons. I hope you understand.
