No surprises about the camera sensor, this fully correlates with my experience with 1Dx and some measurements done by other people - e.g. one French photographer specializing on astronomy - unfortunately do not remember his name.
For indoor events like sports/shows/artist performances in low light 1Dx is probably the best camera ever from Canon - results are amazing - one part of that is sensor high ISO performance and the other is outstanding autofocus capabilities. It does easily what was almost impossible before. Few days ago I was shooting world stars ballet performance and results are stunning.
Unfortunately cannot post any shots here - not allowed without special permission from the performance owners.
But for high DR landscape photography it is definitely not the best tool - I posted some examples recently.
Seems that from Canon for landscaper type of photography 1Ds is still the best one – one good reason to keep it until new big mpx camera from Canon will come to existence.
And again there is nothing wrong in DXO measurements.
For those who are blaming DXO for numbers which they do not like I would recommend to calm down, learn some math and physics, tests methodologies and procedures and many other related things. Then digest all that , stop and try to think and understand what it is all about (I mean DXO measurements). And one more thing again - they do not measure overall cameras performance features wise, they just measuring sensor in the camera , nothing more to that.