Canon Adds Uncompressed HDMI output to 5DMK3

[skital]

how will this compare to the bmcc?

Under very controlled lighting it could hold up fairly well, but under harsh contrast lighting, very detailed scenes, heavy color grading or chroma keying that's when the BMCC will shine noticeably. The 5D MK3 will fall apart quicker with heavy image grading. RAW is simply superior for grading, especially due to the 8-bit color of the MK3 vs 12-bit of the BMCC.

Which recorder would be recommended?

Not completely sure on this, but it seems a lot of people use the Atmos Ninja for external HDMI recording.

Is 8bit vs 12bit much of a difference (not doing any keying work).

It can be. It's not going to be in every instance, but in some it will in a lot. Watch this video to see the difference between 12-bit vs the highest quality 8-bit.



And here is the original video comparing the BMCC to the 5D MK3 where you will see the difference in dynamic range, detail, color, etc:

 

[dustwaterwindfire]

I love the 5d III- I own one. But there is no comparison between it and the BMCC. The BMCC will outshine the 5dIII in every way except for FOV and thats the truth. I will own a BMCC when its readily available- anyone that chooses a 5dIII or any other DSLR over it saying they are "close enough" are fooling themselves. BMCC is the truth. Of course this is my opinion.