The only real answer for all your needs would be a 5D3. I'd be happy to get a 6D though if I were in your shoes.
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Power went out during my son's birthday tonight and so I had to crank the ISO to 5000 and shoot with ambient light. This shot is straight out of camera, ISO 5000, 1/50th second shutter speed at 70mm (Tamron 24-70mm VC):
(Even at 100% the grain looks like about ISO 800 a generation ago)
3. The 5D2's AF is NOT BAD AT ALL for those who know what they are doing.
if YOU knew what your saying you would not make such a simple statement.
the 5D MK2 AF is BAD compared to the MK3 AF for anything that needs tracking... period.
it has absolutely nothing to do with "those who know what they are doing".
those who know what they are doing, will have a way higher number of keepers with the 5D MK3 tracking.
a F1 driver, no matter how good, can not compete with a ford bronco on a F1 racetrack.
But, mainly, a pixel is a pixel, and it really doesn't matter what size the sensor was. Full Frame can deliver a better image sometimes, but there is a reason Canon's lead Action camera was a crop body (APS-H).
I tried the VAF-5D2b filter on the 6D. While most of the moire is gone (you have to set the sharpness at -4 when shooting), the video quality is "soft". If you try to add sharpness in post, the moire comes back. The few tests I did, the 6D is better for indoor shooting. Outdoor is more difficult. I can't get details for wide shots (background subjects appear too soft in my opinion).